Exercise 3.1
1. Write all the factors of the following numbers.
(a) 30
(b) 42
(c) 68
(d) 96
2. Determine whether 9 is a factor or not of the following numbers.
(a) 987
(b) 198
(c) 1428
3. Write the first five multiples of each of the following.
(a) 4
(b) 7
(c) 16
(d) 23
(e) 28
4. Identify whether the given numbers are prime or composite.
(a) 27
(b) 43
(c) 249
(d) 113
(e) 307
5. Express each of the following numbers as the sum of two odd primes.
(a) 36
(b) 52
(c) 84
6. Express each of the following numbers as the sum of three odd primes.
(a) 51
(b) 93
(c) 107
7. Write the greatest prime number between the given numbers.
(a) 21 and 35
(b) 17 and 79
(c) 22 and 47
8. Write the prime numbers between the given numbers.
(a) 40 and 10
(b) 25 and 45
9. Write 6 pairs of prime numbers less than 25 whose sum is divisible by 5.
10. List all the twin prime numbers between 51 and 100.
Answers
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Answer:
factors of 30 1,2,3,5,6,10
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