RS Aggarwal Vikash Aggarwal Class 5 Activity Book Composite Mathematics Activity Sheet 34 Solution

RS Aggarwal Vikash Aggarwal Class 5 Activity Book Composite Mathematics Activity Sheet 34 Solution

Activity Sheet – 34

(1) Write two prime numbers whose difference is 1 3 and 2. How many such pairs are there?

Ans: (2 and 1).

(2) Give examples of five pairs of twin-primes.

Ans: (3, 5); (5, 7); (11, 13); (17, 19); (29, 31).

(3) Give examples of four pairs of prime numbers such that the sum of the numbers in each pair is also a prime number

Ans: 2 + 3 = 5

2 + 5 = 7

2 + 11 = 13

2 + 17 = 19

(4) Give an example of a 2-digit number which is divisible by 2 but not by 4.   

Ans: 22.

(5) Give an example of a 3-digit number which is divisible by 2 but not by 4. 

Ans: 222.

(6) Give an example of a 2-digit n umber which is divisible by 3 but not by 9. 

Ans: 24.

(7) Give an example of a 3-digit number which is divisible by 3 but not by 9. 

Ans: 246.

(8) Give an example of a 3-digit number which is divisible by 3 but not by 6. 

Ans: 123.

(9) Give an example of a 4-digit number which is divisible by 2 but not by 6. 

Ans: 1234.

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