Number bonds to 10, 20 + 100

Making 10, 20 and 100 Adding can be a lot easier if we remember numbers that add to 10. Complete these number sentences to make 10. 3 + 7 = 10 + 7 = 10 9 + 1 = 10 9 + = 10 4 + = 10 4 + 6 = 10 + 3 = 10 7 + 3 = 10 1 + 9 = 10 1 + = 10 8 + 2 = 10 8 + = 10 + 8 = 10 2 + 8 = 10 + 5 = 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 – 7 = 3 10 – 1 = 9 10 – 1 = 9 10 – 6 = 4 10 – 6 = 4 10 – 3 = 7 10 – 3 = 7 10 – 9 = 1 10 – 9 = 1 10 – 5 = 5 10 – 5 = 5 10 – 8 = 2 10 – 8 = 2 10 – 2 = 8 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 10 + 90 = 100 100 – 70 = 30 100 – 70 = 30 70 + 30 = 100 70 + 30 = 100 100 – 60 = 40 100 – 60 = 40 50 + 50 = 100 50 + 50 = 100 100 – 90 = 10 100 – 90 = 10 80 + 20 = 100 80 + 20 = 100 100 – 80 = 20 100 – 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 13 + 7 = 20 9 + 11 = 20 9 + 11 = 20 4 + 16 = 20 4 + 16 = 20 17 + 3 = 20 17 + 3 = 20 1 + 19 = 20 1 + 19 = 20 15 + 5 = 20 15 + 5 = 20 12 + 8 = 20 12 + 8 = 20 2 + 18 = 20 2 + 18 = 20