How_To_Be_Good_At_Math

CALCULATING • FACTOR PAIRS 101

Factor pairs

Two whole numbers that are multiplied together to

make a third number are called factor pairs of that

number. Every whole number has a factor pair,

even if it’s only itself multiplied by 1.

1 1,1

2 1,2

3 1,3

4

1,4

2,2

5 1,5

6

1,6

2,3

7 1,7

8

1,8

2,4

9

1,9

3,3

10

1,10

2,5

11 1,11

12

1,12

2,6

3,4

Number Factor pairs Array

Finding pairs

Can you find all the

factor pairs for each of

these numbers? Draw

them out as arrays if you

find it helpful.

Every whole number

has at least one factor

pair – the number

1 and itself.

Answers on page 319

TRY IT OUT

Factor pairs for 1 to 12

Learning factor pairs is the

same as learning the number

facts for multiplication.

Knowing these basic pairs will

help you with multiplication

calculations. This table shows

all the factor pairs of the

numbers from 1 to 12. Each

pair has also been drawn

as an array, like the arrays

we saw on pages 98-99.

14

60

35

18

24

100_101_Multiplication_as_scaling_Factor_pairs.indd 101 29/02/2016 14:10