Number bonds are pairs of numbers which add together to make up each number. The number bonds for seven, for instance, are 3+4, 2+5, 1+6 and 0+7. To have a quick grasp of addition and subtraction, it's vital to know number bonds for each number up to ten.
In school we play lots of matching games to learn these facts.
Below is a documents containing games for practicing number bonds to 10, 100, 20 and doubles and halves.