NCERT Solutions Class 6 Mathematics Chapter 1 Knowing Our Numbers

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Q.1: Can you instantly find the greatest and the smallest numbers in each row? 
1. 382, 4972, 18, 59785, 750. 
2. 1473, 89423, 100, 5000, 310. 
3. 1834, 75284, 111, 2333, 450 . 
4. 2853, 7691, 9999, 12002, 124. 
Was that easy? Why was it easy?

Ans : 1. 59785 is the greatest and 18 is the smallest.
2. 89423 is the greatest and 100 is the smallest.
3. 75284 is the greatest and 111 is the smallest.
4. 12002 is the greatest and 124 is the smallest. 

Q.2: Find the greatest and the smallest numbers. 
(a) 4536, 4892, 4370, 4452. 
(b) 15623, 15073, 15189, 15800. 
(c) 25286, 25245, 25270, 25210. 
(d) 6895, 23787, 24569, 24659.

Ans : (a) 4892 is the greatest and 4370 is the smallest.
(b) 15800 is the greatest and 15073 is the smallest.
(c) 25286 is the greatest and 25210 is the smallest.
(d) 24787 is the greatest and 6895 is the smallest. 

Q.3: Use the given digits without repetition and make the greatest and smallest 4-digit numbers. 
(a) 2, 8, 7, 4 
(b) 9, 7, 4, 1 
(c) 4, 7, 5, 0 
(d) 1, 7, 6, 2 
(e) 5, 4, 0, 3
(Hint : 0754 is a 3-digit number.)

Ans : a. greatest-8742
    smallest-2478


b.greatest-9741
   smallest-1479


c.greatest-7540
   smallest-40577


d.greatest-7621
   smallest-1267


e.greatest-5430
   smallest-3045 

Q.4: Now make the greatest and the smallest 4-digit numbers by using any one digit twice.
(a) 3, 8, 7 
(b) 9, 0, 5 
(c) 0, 4, 9 
(d) 8, 5, 1 
(Hint : Think in each case which digit will you use twice.)

Ans : (a) Greatest = 8873
      Smallest = 3387


(b) Greatest = 9950
     Smallest = 5509


(c) Greatest = 9940
      Smallest = 4409


(d) Greatest = 8851
     Smallest = 1158 

Q.5: Make the greatest and the smallest 4-digit numbers using any four different digits with conditions as given. 


(a) Digit 7 is always at ones place 
 


(b) Digit 4 is always at tens place
 


(c) Digit 9 is always at hundreds place 
  


(d) Digit 1 is always at thousands place 

Ans : For Smallest number - 
(a) 7000
(b) 1400
(c) 1190
(d) 1111


For Largest number - 
(a) 7999
(b) 9499
(c) 9999
(d) 9991 

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