Gcse Maths (Multiples And Factors)

Front 1

What are prime numbers?

Back 1

A whole number greater than 1 that has exactly two factors, itself and 1.

Front 2

List the first ten prime numbers.

Back 2

2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

Front 3

What are the three steps of the method for determining prime numbers?

Back 3

1) Find its square root
2) List all primes which are less than this square root
3) Divide the original number by all these primes under test (if any divide cleanly, it is not a prime number).

Front 4

What are multiples?

Back 4

The multiples of a number are its times table (e.g. the multiples of 13 are 13, 26, 39, 52, 65...)

Front 5

What are factors?

Back 5

All the numbers that divide into it.

Front 6

Find all the factors of 24.

Back 6

1x24
2x12
3x8
4x6
5x-
6x4
Factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24.

Front 7

Express 60 as a product of its prime factors. Give your answer in index form.

Back 7

2 ^2 x 3 x 5

Front 8

How do you check that a number divides by 3.

Back 8

Add numbers and see if total divides by 3.