MATHS 1 Mark Question

Common factors of 17 and 18 is only 1. So, 17 and 18 are co-prime numbers.

Common factors of 50 and 52 are 1 and 2. So, 50 and 52 are not co-prime numbers.

Common factors of 15 and 16 is only 1. So, 15 and 16 are co-prime numbers.

Common factor of 5 and 7 is only 1. So, 5 and 7 are co-prime numbers.

Common factors of 11 and 30 is only 1. So, 11 and 30 are co-prime numbers

Common factors of 10 and 33 is only 1. So, 10 and 33 are co-prime numbers.

Common factors of 14 and 21 are 1 and 7. So, this pair is not co-prime numbers.

Common factors of 22 and 24 are 1 and 2. (Not only 1 common factor) So, 22, 24 are not co-prime numbers.

All prime numbers are odd except 2.

43 lies between prime numbers 41 and 47

1

23, 29, 31, 37, 41, 43, 47

Only even prime number is 2. (the Rest of the even numbers are composites.)

Composite numbers between 21 and 50 are 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49.

2, 3, 5, 7, 11, 13, 17, 19.

3 as well as 5 means 3 and 5. i.e. multiples of 15.
They are 15, 30, 45, 60, 75.

112, 116, 120, 124, 128.

14, 21, 28, 35, 42

2 as well as of 3 means 2 and 3 that is multiples of 6.
They are 6, 12, 18, 24, 30.

100, 110, 120, 130, 140.

100, 105, 110, 115, 120.

100, 102, 104, 106, 108.

33 is exactly divisible by 1, 3, 11, 33.
So, 1, 3, 11, 33 are the factors of 33.

32 is exactly divisible by 1, 2, 4, 8,16, 32. So, 1, 2, 4, 8, 16, 32 are the factors of 32.

25 is exactly divisible by 1, 5, 25. So, 1, 5, 25 are the factors of 25.

22 is exactly divisible by 1, 2, 11, 22.
So, 1, 2, 11, 22 are the factors of 22.

7 is exactly divisible by 1, 7.
So, 1, 7 are factors of 7.

10 is exactly divisible by 1, 2, 5, 10.
So, 1, 2, 5, 10 are the factors of 10.

14 is exactly divisible by 1, 2, 7, 14.
So, 1, 2, 7, 14 are the factors 14.

5 is exactly divisible by 1, 5.
So, 1, 5 are factors of 5.

8 is exactly divisible by 1, 2, 4, 8.
So, 1, 2, 4, 8 are factors of 8.