# Factors

## Trending Questions

**Q.**

Question 1 (a)

Find the common factors of:

20 and 28

**Q.**

Find the factors of $288$.

**Q.**

Write down separately the prime and composite numbers less than $20$.

**Q.**

Question 2 (b)

Find the common factors of:

15 and 25

**Q.**

Whats the Lowest Common Multiple (LCM) of $12$ and $15$?

**Q.**

Three different containers contain 403 L , 434L , 465 L, of milk respectively. Find the capacity of a container which can measure the milk of all the containers in an exact number of times .

**Q.**

- 1
- itself
- 2
- next number

**Q.**

If two numbers are co-primes, at least one of them must be prime.

True

False

**Q.**

A and B are two positive integers such that AB=64.Which of the following is not the correct value of A+B?

a) 65 b) 35

c) 16 d) 20

**Q.**Which is the missing number in the following factor tree?

- 2
- 3
- 4
- 12

**Q.**

Which number is the only even prime number?

$0$

$2$

$4$

$6$

**Q.**

A number which is divisible by only 1 and the number itself is called ________.

an even number

an odd number

a prime number

a composite number

**Q.**

What is the factorial of $20$?

**Q.**

Find the HCF of the two numbers 132 and 165.

37

39

33

34

**Q.**

Two numbers having _____ as the only common factor are called ________ numbers.

2, twin prime

2, co-prime

1, co-prime

1, twin prime

**Q.**

Two numbers having '1' as the only common factor are called

**Q.**

The LCM of 18, 24 & 32 is _______.

288

32

24

432

**Q.**Find the smallest no. which when divided by 28 and 32 leaves remainder 8 and 12.

**Q.**

Question 6 (c)

Express the following as the sum of two odd primes:

24

**Q.**

5 and 12 are co-prime numbers.

True

False

**Q.**

Every factor of a number is an exact

**Q.**

List all composite numbers from

$31$ to $50$

**Q.**Find the prime numbers from the following.

30, 31, 32, 33, 34, 35, 36, 37, 38, 39.

- 32 and 39
- 30 and 34
- 31 and 37
- 35 and 37

**Q.**

Three brands A, B and C of biscuits are available in packets of 12, 15, and 21 biscuits respectively.

If a shopkeeper wants to buy an equal number of biscuits of each brand, then what is the minimum number of packets of each brand he should buy? [4 MARKS]

**Q.**

Write the first six multiples of:

$8$

**Q.**

Write the first six multiples of:

$6$

**Q.**Express the greatest 2-digit number as a product of its prime factors.

**Q.**From the choices given below, mark the co-prime numbers.

- 2, 110
- 10, 20
- 9, 24
- 4, 5

**Q.**

From the numbers 2, 3, 4, 5, 6, 7, 8, 9 how many pairs of co- primes can be formed and how ?

**Q.**Which of the following is a pair of co-prime numbers?

- 6, 9
- 4, 7
- 5, 10
- 4, 8