NCERT Solutions for Class 2 Maths Chapter 6 Decoration for Festival (PDF) – 2027
By · Updated
NCERT Solutions for Class 2 Maths Joyful Mathematics Chapter 6 Decoration for Festival – step-by-step answers to every exercise and in-text question of the chapter, as per the latest NCERT syllabus for 2027. Read them online or download the free question-answer PDF.
This chapter is about adding and taking away. We use garlands, the ginladi, the number line, and tens and ones.
NCERT Solutions for Class 2 Maths Joyful Mathematics Chapter 6 Decoration for Festival PDF
All the answers are on this page below. The PDF also explains every answer – why it is right and how to check it – so download it for revision.
NCERT Solutions for Class 2 Maths Joyful Mathematics Chapter 6 Decoration for Festival – Questions and Answers
All 91 questions of the chapter (textbook pages 50 – 70) are answered below, in the order of the book – in-text questions, activities and the end-of-chapter exercises. Each answer is written the way you would write it in the exam.
Decoration for Celebration! — Page 50Complete the table from the picture
Q1Rohan and his friends need garlands to decorate their homes for celebration. Each garland has 10 flowers. Complete the given table with the help of the above picture. Suwali’s row: the number of flowers.The garlands and loose flowers near each child.
Name
Number of garlands
Number of flowers
Total number of flowers
Rohan
1
2
10 + 2 = 12
Simran
3
7
30 + 7 = 37
Akash
4
8
40 + 8 = 48
Suwali
5
50 + 3 = 53
Javed
Zoha
Answer
Suwali has 3 loose flowers.
Suwali has 5 garlands. That is 50 flowers.
Her total is 50 + 3 = 53.
So 3 flowers are loose.
Q2Rohan and his friends need garlands to decorate their homes for celebration. Each garland has 10 flowers. Complete the given table with the help of the above picture. Javed’s row.The garlands and loose flowers near each child.
Name
Number of garlands
Number of flowers
Total number of flowers
Rohan
1
2
10 + 2 = 12
Simran
3
7
30 + 7 = 37
Akash
4
8
40 + 8 = 48
Suwali
5
50 + 3 = 53
Javed
Zoha
Answer
Javed: 4 garlands, 3 flowers, 40 + 3 = 43.
Count Javed’s garlands: 4.
Count his loose flowers: 3.
4 garlands are 40 flowers. 40 + 3 = 43.
Q3Rohan and his friends need garlands to decorate their homes for celebration. Each garland has 10 flowers. Complete the given table with the help of the above picture. Zoha’s row.The garlands and loose flowers near each child.
Name
Number of garlands
Number of flowers
Total number of flowers
Rohan
1
2
10 + 2 = 12
Simran
3
7
30 + 7 = 37
Akash
4
8
40 + 8 = 48
Suwali
5
50 + 3 = 53
Javed
Zoha
Answer
Zoha: 2 garlands, 0 flowers, 20 + 0 = 20.
Count Zoha’s garlands: 2.
She has no loose flowers. Write 0.
2 garlands are 20 flowers.
Name
Number of garlands
Number of flowers
Total number of flowers
Rohan
1
2
10 + 2 = 12
Simran
3
7
30 + 7 = 37
Akash
4
8
40 + 8 = 48
Suwali
5
3
50 + 3 = 53
Javed
4
3
40 + 3 = 43
Zoha
2
0
20 + 0 = 20
In-text Questions — Page 51Rohan and Suwali add their flowers
Q1How many flowers are used by Rohan and Suwali together? “I have 10 + 2 = 12 flowers.” “I have 50 + 3 = 53 flowers.”
Rohan brings
1 garland, 2 flowers
10 + 2 = 12
Suwali brings
5 garlands, 3 flowers
50 + 3 = 53
Suwali and Rohan together bring
________
________
Answer
65 flowers.
Add the ones: 2 + 3 = 5.
Add the tens: 1 + 5 = 6.
6 tens and 5 ones make 65.
In-text Questions — Page 52Zoha, Javed and Akash
Q1How many flowers are used by Zoha and Javed in all?
Zoha brings
2 garlands, 0 flowers
20 + 0 = 20
Javed brings
4 garlands, 3 flowers
40 + 3 = 43
Zoha and Javed together bring
________
________
Answer
63 flowers.
Add the ones: 3 + 0 = 3.
Add the tens: 4 + 2 = 6.
So 43 + 20 = 63.
Q2What is the total number of flowers used by Zoha and Akash?
Zoha brings
2 garlands, 0 flowers
20 + 0 = 20
Akash brings
________
________
Zoha and Akash together bring
________
________
Answer
68 flowers.
Akash has 4 garlands and 8 flowers: 48.
Add the ones: 8 + 0 = 8.
Add the tens: 4 + 2 = 6. So 68.
Zoha brings
2 garlands, 0 flowers
20 + 0 = 20
Akash brings
4 garlands, 8 flowers
40 + 8 = 48
Zoha and Akash together bring
6 garlands, 8 flowers
60 + 8 = 68
In-text Questions — Page 53Rohan and Simran
Q1What is the total number of flowers used by Rohan and Simran?
Rohan brings
________
________
Simran brings
________
________
Rohan and Simran together bring
________
________
Answer
49 flowers.
Rohan has 12. Simran has 37.
Add the ones: 2 + 7 = 9.
Add the tens: 1 + 3 = 4. So 49.
Rohan brings
1 garland, 2 flowers
10 + 2 = 12
Simran brings
3 garlands, 7 flowers
30 + 7 = 37
Rohan and Simran together bring
4 garlands, 9 flowers
40 + 9 = 49
Let us do it on Ginladi! — Page 53Adding on a string of beads
Q1A. 25 + 12 = ____ “Count 12 ahead of 25.”A ginladi. The beads shown go from 1 to 40.
Answer
25 + 12 = 37
Find bead 25.
Count 12 beads ahead: 26, 27, … 37.
You stop at 37.
Q2B. 57 + 34 = ____ Count ____ ahead of ____A ginladi. The beads shown go from 51 to 95.
Answer
57 + 34 = 91. Count 34 ahead of 57.
Start at 57.
Jump 3 tens: 67, 77, 87.
Then 4 ones: 88, 89, 90, 91.
3 jumps of 10, then 4 ones.
Q3C. 24 + 43 = ____ We can write 24 + 40 + 3 = 64 + 3 = 67A ginladi. The beads shown go from 21 to 70.
Answer
24 + 43 = 67
Start at 24.
Jump 4 tens: 34, 44, 54, 64.
Then 3 ones: 65, 66, 67.
Now add numbers on the number line — Page 54A (23 + 14 = 37) is done in the book
Q1Now add numbers on the number line. B. 24 + 16 = ____A number line from 20 to 40.
Answer
24 + 16 = 40
Start at 24.
Jump 10: you reach 34.
Jump 6 more: 35, 36, … 40.
The jumps on the number line.
Q2Now add numbers on the number line. C. 11 + 22 = ____A number line from 10 to 35.
Answer
11 + 22 = 33
Start at 11.
Jump 10 two times: 21, 31.
Then 2 more: 32, 33.
The jumps on the number line.
Read the number line and fill the boxes — Pages 54–55Find the missing numbers from the jumps
Q1Read the number line and fill the boxes. A. 22 + ____ = 38A number line from 20 to 40.
Answer
22 + 16 = 38
The jumps are +10 and +6.
10 + 6 = 16.
Q2Read the number line and fill the boxes. B. 18 + ____ = ____A number line from 15 to 35.
Answer
18 + 13 = 31
The jumps are +10 and +3. That is 13.
The last jump stops at 31.
Q3Read the number line and fill the boxes. C. ____ + ____ = ____A number line from 10 to 35.
Answer
11 + 23 = 34
The jumps start at 11.
+10, +10 and +3 make 23.
They stop at 34.
Add these Numbers — Page 55Tens and ones
Q1Add these Numbers
Answer
67
Add the ones: 4 + 3 = 7.
Add the tens: 4 + 2 = 6.
Q2Add these Numbers
Answer
79
Add the ones: 6 + 3 = 9.
Add the tens: 5 + 2 = 7.
Q3Add these Numbers
Answer
85
Add the ones: 0 + 5 = 5.
Add the tens: 6 + 2 = 8.
Q4Add these Numbers
Answer
82
Add the ones: 2 + 0 = 2.
Add the tens: 5 + 3 = 8.
Playing with Blocks — Page 55Mahi’s blocks and Isha’s blocks
Q1Mahi has some blocks. Isha came with her blocks to play. Let us help them in finding how many blocks they have in total.Each stick is 1 ten. Each loose block is 1 one.
Answer
61 blocks. That is 6 tens 1 one.
Tens: 2 + 3 = 5 tens.
Ones: 3 + 8 = 11 ones.
10 ones make 1 more ten. So 6 tens and 1 one.
6 tens and 1 one.
Let us find the total number of blocks — Page 56Rows 2 to 5
Q1Let us find the total number of blocks. Row 1 is done: 3 tens 6 ones + 4 tens 7 ones → 7 tens 13 ones → 8 tens and 3 ones → 80 + 3 = 83. Fill the two empty boxes for this row.Each stick is 1 ten. Each loose block is 1 one.
Answer
8 tens 14 ones → 9 tens and 4 ones. 90 + 4 = 94
Put the tens together: 4 + 4 = 8 tens.
Put the ones together: 5 + 9 = 14 ones.
14 ones = 1 ten and 4 ones.
9 tens and 4 ones.
Q2Let us find the total number of blocks. Row 1 is done: 3 tens 6 ones + 4 tens 7 ones → 7 tens 13 ones → 8 tens and 3 ones → 80 + 3 = 83. Fill the two empty boxes for this row.Each stick is 1 ten. Each loose block is 1 one.
Answer
8 tens 10 ones → 9 tens and 0 ones. 90 + 0 = 90
Put the tens together: 5 + 3 = 8 tens.
Put the ones together: 8 + 2 = 10 ones.
10 ones = 1 ten and 0 ones.
9 tens and 0 ones.
Q3Let us find the total number of blocks. Row 1 is done: 3 tens 6 ones + 4 tens 7 ones → 7 tens 13 ones → 8 tens and 3 ones → 80 + 3 = 83. Fill the two empty boxes for this row.Each stick is 1 ten. Each loose block is 1 one.
Answer
9 tens 4 ones. 90 + 4 = 94
Put the tens together: 8 + 1 = 9 tens.
Put the ones together: 4 ones.
9 tens and 4 ones.
Q4Let us find the total number of blocks. Row 1 is done: 3 tens 6 ones + 4 tens 7 ones → 7 tens 13 ones → 8 tens and 3 ones → 80 + 3 = 83. Fill the two empty boxes for this row.Each stick is 1 ten. Each loose block is 1 one.
Answer
6 tens 14 ones → 7 tens and 4 ones. 70 + 4 = 74
Put the tens together: 2 + 4 = 6 tens.
Put the ones together: 6 + 8 = 14 ones.
14 ones = 1 ten and 4 ones.
7 tens and 4 ones.
Add — Page 57Adding ones, adding tens, shifting the tens
Q1“Isha, do you know, we can add without counting all the blocks again and again?” “Oh really, Mahi! Can you show me how?”
Answer
Yes! 36 + 47 = 83.
Adding ones: 6 + 7 = 13. That is 1 ten and 3 ones.
Write 3. Shift the 1 ten to the tens.
Adding tens: 3 + 4 + 1 = 8.
Q2Add
Answer
85
Add the ones: 6 + 9 = 15. That is 1 ten 5 ones.
Write 5. Shift the 1 ten to the tens.
Add the tens: 4 + 3 + 1 = 8.
Q3Add
Answer
75
Add the ones: 6 + 9 = 15. That is 1 ten 5 ones.
Write 5. Shift the 1 ten to the tens.
Add the tens: 5 + 1 + 1 = 7.
Q4Add
Answer
44
Add the ones: 6 + 8 = 14. That is 1 ten 4 ones.
Write 4. Shift the 1 ten to the tens.
Add the tens: 3 + 1 = 4.
Q5Add
Answer
88
Add the ones: 0 + 8 = 8.
Add the tens: 3 + 5 = 8.
Q6Add
Answer
80
Add the ones: 5 + 5 = 10. That is 1 ten 0 ones.
Write 0. Shift the 1 ten to the tens.
Add the tens: 4 + 3 + 1 = 8.
Let us Do — Pages 57–58Adding in word problems
Q1A. Rahim made 43 runs in one match and 58 runs in another match. How many runs he made in the two matches together? ____
Answer
101 runs.
Add the ones: 3 + 8 = 11. Write 1. Shift the 1 ten.
Add the tens: 4 + 5 + 1 = 10 tens.
10 tens make 100. So 100 + 1 = 101.
Q2B. Simarpreet had 12 colour pencils. Her mother gifted her 36 more colour pencils. How many total colour pencils does she have now? ____
Answer
48 colour pencils.
Add the ones: 2 + 6 = 8.
Add the tens: 1 + 3 = 4.
Q3C. Heena collected 34 red marbles and 57 blue marbles. How many total marbles does she have now? ____
Answer
91 marbles.
Add the ones: 4 + 7 = 11. That is 1 ten 1 one.
Write 1. Shift the 1 ten to the tens.
Add the tens: 3 + 5 + 1 = 9.
Q4D. Sarika spent ₹56 in the fair, while Manish spent ₹35 in the fair. What is the total money they both spent in the fair? ____
Answer
₹91
Add the ones: 6 + 5 = 11. That is 1 ten 1 one.
Write 1. Shift the 1 ten to the tens.
Add the tens: 5 + 3 + 1 = 9.
Q5E. There are 36 men and 47 women in the bus. How many people are there in the bus? ____
Answer
83 people.
Add the ones: 6 + 7 = 13. That is 1 ten 3 ones.
Write 3. Shift the 1 ten to the tens.
Add the tens: 3 + 4 + 1 = 8.
Let us Count Diyas — Pages 58–59Taking away by counting back
Q1“I made 75 diyas in a day and sold 35 out of them.” “Let me count how many diyas are left now? 1, 2, 3…”
Answer
40 diyas are left.
Start at 75.
Selling 35 means count 35 back.
Back 10 three times: 65, 55, 45. Then 5 more: 40.
Q2“I have another way of doing it. We can draw as many lines as the number of diyas left.” “Interesting! Is there any other way to find out?”
Answer
Yes. Use the ginladi.
Count 75 beads first.
Then go 35 steps backward.
You reach bead 40. So 75 − 35 = 40.
75, then 35 steps back.
Q3“If we have 32 diyas in the morning and 12 diyas are sold by the evening. How many diyas are left?”A ginladi. The beads shown go from 1 to 40.
Answer
20 diyas are left.
Start at 32 on the ginladi.
Go back 10: 22.
Go back 2 more: 20.
32, then 12 steps back.
In-text Questions — Page 60We can also use the ginladi to find the answers
Q1We can also use the ginladi to find the answers of the following. A. Take away 9 from 18 18 − 9 = ____A ginladi. The beads shown go from 1 to 40.
Answer
18 − 9 = 9
Start at bead 18.
Go back 9 steps: 17, 16, … 9.
Q2We can also use the ginladi to find the answers of the following. B. Take away 8 from 12 12 − 8 = ____A ginladi. The beads shown go from 1 to 40.
Answer
12 − 8 = 4
Start at bead 12.
Go back 8 steps: 11, 10, … 4.
Q3We can also use the ginladi to find the answers of the following. C. Take away 18 from 30 30 − 18 = ____A ginladi. The beads shown go from 1 to 40.
Answer
30 − 18 = 12
Start at bead 30.
Go back 10: 20.
Go back 8 more: 12.
Q4We can also use the ginladi to find the answers of the following. D. Take away 14 from 23 23 − 14 = ____A ginladi. The beads shown go from 1 to 40.
Answer
23 − 14 = 9
Start at bead 23.
Go back 10: 13.
Go back 4 more: 9.
Q5We can also use the ginladi to find the answers of the following. E. Take away 17 from 26 26 − 17 = ____A ginladi. The beads shown go from 1 to 40.
Answer
26 − 17 = 9
Start at bead 26.
Go back 10: 16.
Go back 7 more: 9.
In-text Questions — Page 61A ginladi on paper
Q1“Yesterday, we counted left out diyas on the ginladi.” “Tell me how you did it? But, I don’t have a ginladi at my home.” “Let us make a ginladi on the paper then.”
Answer
Draw a number line on paper. Use it like a ginladi.
Write 1 to 20 on a line.
For 19 − 15, start at 19.
Jump back 10 to 9. Then 5 steps back to 4.
Back 10, then back 5.
Let us do some practice on number line — Page 62Taking away on the number line
Q1Read the number line and fill the boxes. A. 26 − ____ = ____A number line from 8 to 28.
Answer
26 − 15 = 11
Count the small jumps: 15.
They start at 26 and stop at 11.
Q2Read the number line and fill the boxes. B. 39 − 28 = ____A number line from 8 to 40.
Answer
39 − 28 = 11
Two big jumps back: 29, then 19.
Then 8 small jumps: 11.
10 + 10 + 8 = 28 steps.
Q3Read the number line and fill the boxes. C. ____ − ____ = ____A number line from 6 to 40.
Answer
40 − 31 = 9
The jumps start at 40.
Three jumps of 10 and one of 1: 31.
They stop at 9.
Q4Read the number line and fill the boxes. D. 38 − 11 = ____A number line from 22 to 40.
Answer
38 − 11 = 27
Jump back 10: 28.
Jump back 1: 27.
Q5Read the number line and fill the boxes. E. 22 − 22 = ____A number line from 1 to 24.
Answer
22 − 22 = 0
Start at 22.
Go back 22 steps.
Nothing is left.
Q6Read the number line and fill the boxes. F. 14 − 0 = ____A number line from 1 to 20.
Answer
14 − 0 = 14
Start at 14.
Go back 0 steps.
You stay at 14.
Q7Read the number line and fill the boxes. G. 35 − 12 = ____A number line from 20 to 40.
Answer
35 − 12 = 23
Start at 35.
Jump back 10: 25.
Go back 2 more: 23.
Playing with Blocks — Page 63Subtract 24 from 37
Q1Subtract 24 from 373 tens 7 ones. Take away 2 tens 4 ones.
Answer
13
Take away the ones: 7 − 4 = 3.
Take away the tens: 3 − 2 = 1.
Let us Do — Page 63Subtract. No ten needs opening here.
Q1Let us Do
Answer
11
Take away the ones: 4 − 3 = 1.
Take away the tens: 2 − 1 = 1.
Q2Let us Do
Answer
23
Take away the ones: 4 − 1 = 3.
Take away the tens: 5 − 3 = 2.
Q3Let us Do
Answer
20
Take away the ones: 2 − 2 = 0.
Take away the tens: 3 − 1 = 2.
Q4Let us Do
Answer
12
Take away the ones: 6 − 4 = 2.
Take away the tens: 4 − 3 = 1.
Q5A. Shikha has ₹82. She bought pencils for ₹22. How much money is she left with? ____
Answer
₹60
Take away the ones: 2 − 2 = 0.
Take away the tens: 8 − 2 = 6.
Q6B. Ruby has ₹60. She bought a notebook for ₹20. How much money is she left with? ____
Answer
₹40
Take away the ones: 0 − 0 = 0.
Take away the tens: 6 − 2 = 4.
Decorating with Garlands — Pages 64–66Opening a garland (a ten) to take away
Q1Decorating with Garlands “Jyoti, can I have 1 garland and 8 flowers?” “I have only 6 loose flowers. I think I should open a garland.” “Now I can give 8 flowers to mummy.”Garlands of 10 flowers and loose flowers.
Answer
46 − 18 = 28. Jyoti is left with 28 flowers.
Jyoti has 4 garlands and 6 flowers: 46.
6 flowers are too few to give 8. She opens 1 garland: 3 garlands and 16 flowers.
16 − 8 = 8. Then 3 − 1 = 2.
Q2Now, Jyoti has 28 flowers in all. She gives 5 to her friend. Help Jyoti to find out how many flowers is she left with?Garlands of 10 flowers and loose flowers.
Answer
23 flowers.
Take away the ones: 8 − 5 = 3.
The tens stay 2.
Q3Now, Jyoti has 54 flowers in all. She gives 28 to her mother. How many flowers is she left with?Garlands of 10 flowers and loose flowers.
Answer
26 flowers. That is 2 garlands and 6 flowers.
4 ones are too few to take away 8.
Open 1 ten. Now there are 4 tens and 14 ones.
14 − 8 = 6. Then 4 − 2 = 2.
Q4Jyoti has 73 flowers in all. She gives 47 to her mother. How many flowers is she left with?Garlands of 10 flowers and loose flowers.
Garlands
Flowers
Jyoti has
7
3
Jyoti gives
4
7
Jyoti is left with
Answer
26 flowers: 2 garlands and 6 flowers.
3 ones are too few to take away 7.
Open 1 ten. Now there are 6 tens and 13 ones.
13 − 7 = 6. Then 6 − 4 = 2.
Garlands
Flowers
Jyoti has
7
3
Jyoti gives
4
7
Jyoti is left with
2
6
Let us Do — Page 67Subtract. Open a ten when the ones are too few.
Q1Let us Do
Answer
27
5 ones are too few to take away 8.
Open 1 ten. Now there are 3 tens and 15 ones.
15 − 8 = 7. Then 3 − 1 = 2.
Q2Let us Do
Answer
47
4 ones are too few to take away 7.
Open 1 ten. Now there are 7 tens and 14 ones.
14 − 7 = 7. Then 7 − 3 = 4.
Q3Let us Do
Answer
20
Take away the ones: 5 − 5 = 0.
Take away the tens: 6 − 4 = 2.
Q4Let us Do
Answer
0
Take away the ones: 7 − 7 = 0.
Take away the tens: 2 − 2 = 0.
Nothing is left. Write 0.
Q5Let us Do
Answer
45
3 ones are too few to take away 8.
Open 1 ten. Now there are 8 tens and 13 ones.
13 − 8 = 5. Then 8 − 4 = 4.
Skip the Rope — Page 67How many more to make 20?
Q1Aman and Avni are playing ‘skip the rope’. Both have to complete 20 skips. A skip can be counted when the rope passes under the feet. They will get two chances to skip. If one misses any skip in the first time then they will get one more chance to complete 20 skips. A. Aman skipped 14 times in the first chance. How many more skips he has to make to complete 20 skips? 20 − 14 = ____ 14 + ____ = 20
Answer
6 more skips. 20 − 14 = 6. 14 + 6 = 20.
Start at 14.
Count on to 20: 15, 16, 17, 18, 19, 20.
That is 6 counts.
Q2Aman and Avni are playing ‘skip the rope’. Both have to complete 20 skips. A skip can be counted when the rope passes under the feet. They will get two chances to skip. If one misses any skip in the first time then they will get one more chance to complete 20 skips. B. Avni skipped 12 times in the first chance. How many more skips she has to make to complete 20 skips? ____ 20 − 12 = ____ 12 + ____ = 20
Answer
8 more skips. 20 − 12 = 8. 12 + 8 = 20.
Start at 12.
Count on to 20: 13, 14, … 20.
That is 8 counts.
Let us Do — Page 68Taking away in word problems
Q1“We can use any of the method— ginladi, number strip, number block or moti mala to find the answers.” A. Anushka collected 63 shells. She gave 26 shells to her brother. How many shells are left with her? ____
Answer
37 shells.
3 ones are too few to take away 6.
Open 1 ten. Now there are 5 tens and 13 ones.
13 − 6 = 7. Then 5 − 2 = 3.
Q2B. 54 passengers were sitting in the bus and 16 got down at the bus stand. How many are there in the bus now? ____
Answer
38 passengers.
4 ones are too few to take away 6.
Open 1 ten. Now there are 4 tens and 14 ones.
14 − 6 = 8. Then 4 − 1 = 3.
Q3C. There were 40 balloons and 13 balloons got burst. How many balloons are left? ____
Answer
27 balloons.
0 ones are too few to take away 3.
Open 1 ten. Now there are 3 tens and 10 ones.
10 − 3 = 7. Then 3 − 1 = 2.
Q4D. Kanika made 72 bangles. She sold 36 bangles. How many bangles are left with Kanika now? ____
Answer
36 bangles.
2 ones are too few to take away 6.
Open 1 ten. Now there are 6 tens and 12 ones.
12 − 6 = 6. Then 6 − 3 = 3.
Q5E. 56 birds were sitting on the tree. A few more birds joined them. Now there are 87 birds. Find out the number of birds that came later. ____
Answer
31 birds came later.
Take away the ones: 7 − 6 = 1.
Take away the tens: 8 − 5 = 3.
Q6F. Arman dribbled the ball 18 times. How many more times should he dribble the ball to complete 35 taps? ____
Answer
17 more times.
5 ones are too few to take away 8.
Open 1 ten. Now there are 2 tens and 15 ones.
15 − 8 = 7. Then 2 − 1 = 1.
Addition and Subtraction Facts — Page 69Fact families
Addition and Subtraction Pyramid — Page 69Addition pyramid and subtraction pyramid
Q1Addition and Subtraction Pyramid Addition pyramid (first one)Addition pyramid. Two boxes side by side add up to the box above them.
Answer
Top: 40. Next row: 17, 23. Middle gap: 9.
3 + 6 = 9.
8 + 9 = 17. 9 + 14 = 23.
17 + 23 = 40.
Q2Addition and Subtraction Pyramid Addition pyramid (second one)Addition pyramid. Two boxes side by side add up to the box above them.
Answer
Top: 35. Next row: 17, 18. Middle gap: 7.
4 + 3 = 7.
10 + 7 = 17. 7 + 11 = 18.
17 + 18 = 35.
Q3Addition and Subtraction Pyramid Subtraction pyramid (first one)Subtraction pyramid. Each box is the sum of the two boxes below it.
Answer
Row 2: 21. Row 3: 5, 10. Bottom: 1, 7.
37 − 16 = 21.
16 − 11 = 5. 21 − 11 = 10.
5 − 4 = 1. 11 − 4 = 7.
Q4Addition and Subtraction Pyramid Subtraction pyramid (second one)Subtraction pyramid. Each box is the sum of the two boxes below it.
Answer
Row 2: 26. Row 3: 15, 13. Bottom: 6, 8.
50 − 24 = 26.
26 − 11 = 15. 24 − 11 = 13.
15 − 9 = 6. 13 − 5 = 8.
Look at this diagram — Page 70Now complete the following diagrams
Q1Look at this diagram.Here, 3 + 9 = 12, 9 + 6 = 15, 6 + 5 = 11, 5 + 3 = 8 Now complete the following diagrams. A.
Answer
Top right 4, bottom left 8, bottom right 6.
1 + 4 = 5. So top right is 4.
1 + 8 = 9. So bottom left is 8.
4 + 6 = 10. So bottom right is 6.
Q2Look at this diagram.Here, 3 + 9 = 12, 9 + 6 = 15, 6 + 5 = 11, 5 + 3 = 8 Now complete the following diagrams. B.
Answer
One answer: top 4 and 6, bottom 5 and 7.
Pick top left: 4.
10 − 4 = 6 (top right). 9 − 4 = 5 (bottom left).
13 − 6 = 7 (bottom right).
Hania and Mansi’s Gift — Page 70Add, then take away
Q1Hania and Mansi want to give a gift to their mother. For its decoration, they purchased some ribbons and a gift wrapper. There are ₹78 in the purse. The cost of a gift wrapper is ₹24 and the cost of ribbons is ₹37. A. How much money did they spend? ____
Answer
₹61
Add the ones: 4 + 7 = 11. That is 1 ten 1 one.
Write 1. Shift the 1 ten to the tens.
Add the tens: 2 + 3 + 1 = 6.
Q2Hania and Mansi want to give a gift to their mother. For its decoration, they purchased some ribbons and a gift wrapper. There are ₹78 in the purse. The cost of a gift wrapper is ₹24 and the cost of ribbons is ₹37. B. How much money is left with them? ____
Answer
₹17
Take away the ones: 8 − 1 = 7.
Take away the tens: 7 − 6 = 1.
Project Work — Page 70Check Daljeet’s answers
Q1Daljeet has solved some questions and writen down their answers. What do you think? Are they correct? Verify the answers. Correct it if you find them wrong.
Answer
Wrong. 25 + 36 = 61.
Ones: 5 + 6 = 11. Write 1. Shift 1 ten.
Tens: 2 + 3 + 1 = 6.
Q2Daljeet has solved some questions and writen down their answers. What do you think? Are they correct? Verify the answers. Correct it if you find them wrong.
Answer
Wrong. 37 + 58 = 95.
Ones: 7 + 8 = 15. Write 5. Shift 1 ten.
Tens: 3 + 5 + 1 = 9.
Q3Daljeet has solved some questions and writen down their answers. What do you think? Are they correct? Verify the answers. Correct it if you find them wrong.
Answer
Wrong. 35 − 17 = 18.
5 ones are too few to take away 7.
Open 1 ten. Now there are 2 tens and 15 ones.
15 − 7 = 8. Then 2 − 1 = 1.
Q4Daljeet has solved some questions and writen down their answers. What do you think? Are they correct? Verify the answers. Correct it if you find them wrong.
Answer
Wrong. We cannot take 78 away from 57.
78 is more than 57.
You cannot give 78 when you have only 57.
Daljeet really worked out 78 − 57 = 21. That is right.
Q5Daljeet has solved some questions and writen down their answers. What do you think? Are they correct? Verify the answers. Correct it if you find them wrong.
