Exercise 3.2
- Write all the factors of the following numbers. i. 36 ii. 23 iii. 96 iv. 115
- Which of the following pairs are co-prime? i. 18 and 35 ii. 216 and 215 iii. 30 and 415 iv. 17 and 68
- What is the greatest prime number between 1 and 20?
- Find the prime and composite numbers between 10 and 30?
- The numbers 17 and 71 are prime numbers. Both these numbers have same digits 1 and 7. Find 2 more such pairs of prime numbers below 100?
- Write three pairs of twin primes below 20?
7. Write two prime numbers whose product is 35?
8. Express 36 as the sum of two odd primes?
9. Write seven consecutive composite numbers less than 100.
10. Express 53 as the sum of three primes?
11. Write two prime numbers whose difference is 10?
12. Write three pairs of prime numbers less than 20 whose sum is divisible by 5?