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.