Number Mountains - Number Bonds Addition and Subtraction

Derive the missing number and/or write as many related number sentences as you can think of when you explore number bonds using our Number Mountains. The mountain side shows a missing number that is related to the other two in an addition or subtraction (e.g. 3 + 8 = ?) number sentence. Play included activities in groups, pairs or individually with or without teacher help. The double-sided card mountains come in boxed sets that explore: Number Bonds to 10; Number Bonds to 20; Addition & subtraction of numbers to 100 using number bonds and place value; and multiplication and division of 2s, 5s and 10s to the 10th multiple. Bonds to 20