# Number bonds to 10, 20 + 100 - Georgeham C of E Primary School ```Number bonds to 10, 20 + 100
Making 10, 20 and 100
Adding can be a lot easier if we remember numbers
Complete these number sentences to make 10.
3 + 7 = 10
9 + 1 = 10
4 + 6 = 10
7 + 3 = 10
1 + 9 = 10
8 + 2 = 10
2 + 8 = 10
5 + 5 = 10
Making 10, 20 and 100
Subtraction can also be a lot easier if we remember
pairs of numbers add to 10.
Complete these number sentences.
10 – 7 = 3
10 – 1 = 9
10 – 6 = 4
10 – 3 = 7
10 – 9 = 1
10 – 5 = 5
10 – 8 = 2
10 – 2 = 8
Making 10, 20 and 100
If you know pairs of numbers that make 10 then you
will easily work out pairs of numbers that make 100.
Hint: just add 0 on the end.
10 + 90 = 100
100 – 70 = 30
70 + 30 = 100
100 – 60 = 40
50 + 50 = 100
100 – 90 = 10
80 + 20 = 100
100 – 80 = 20
Making 10, 20 and 100
We can use the numbers that make ten to help us
work out the numbers that add to 20.
Complete these number sentences to make 20.
13 + 7 = 20
9 + 11 = 20
4 + 16 = 20
17 + 3 = 20
1 + 19 = 20
15 + 5 = 20
12 + 8 = 20
2 + 18 = 20
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