Free Year 1 number bonds worksheets: 10 and 20 (PDF)

In Year 1, children learn the number bonds within 20 and the facts that go with them. These three worksheets cover the pairs that make 10, the pairs that make 20, and using a bond to 10 to work out a bond to 20 (if 7 + 3 = 10, then 17 + 3 = 20).

The missing number can be anywhere in the sum, just as it is in Year 1 lessons. One page at a time is plenty.