How_To_Be_Good_At_Math

82 CALCULATING •^ ADDITION FACTS

Compare this

fact with the

last one

This is like

the first fact –

the numbers

are just in a

different order

These facts

should be easy

if you know your

multiplication

table for 2

Addition facts

An addition fact is a simple calculation that you remember without having to

work it out. Your teacher might also call this a number bond or an addition

pair. Knowing simple addition facts will help you with harder calculations.

These addition facts are all doubles. We

call them the addition doubles to 10 + 10.

This time, the answers are different.

These are called the addition facts for

10, because the answer is always 10.

TRY IT OUT

Using addition facts

Can you use the addition facts for 10

and the addition doubles to 10 + 10

to work out the answers to these

calculations?

Answers on page 319

60 + 40 =?

1 + 1 = 2

10 + 0 = 10

0 + 10 = 10

1 + 9 = 10

2 + 8 = 10

3 +^7 = 10

• 64 = 10

==5+5 1010

=4+6 10

7 =3+ 10

8 2 =+ 10

9 + =1 10

2 + 2 = 4

3 + 3 = 6

+4 4 = 8

=5+5 10

+6 6 = 12

• 77 = 14

8 + 8 = 16

9 9+ = 18

10 + =10 20

700 + 700 =?

20 + 80 =?

0.1 + 0.9 =?

70 + 30 =?

4000 + 4000 =?

082_083_Addition_facts_Partitioning_for_addition.indd 82 29/02/2016 18:02