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