Shortcuts in Addition By Monica Yuskaitis

4 + 2 + 5 + 1 = 12 1 + 4 + 5 + 2 = 12 Adding Long Columns Since addition is Commutative it doesn’t matter which numbers you add first. 4 + 2 + 5 + 1 = 12 1 + 4 + 5 + 2 = 12

Adding Long Columns Begin by looking for combinations of ten. 34 57 83 26 +

34 57 83 26 Adding Long Columns Add up your ten combinations first. +

34 57 83 26 Adding Long Columns Add up your ten combinations again. + 2 0

Review Combinations of Ten 9 1 + = 10 5 + = 10 8 + = 10 7 + = 10 2 + = 10 6 + = 10 4 + = 10 3 + = 10 9 + =10 5 2 3 8 4 6 7 1

Adding Long Columns When a number keeps repeating use multiplication. 2 32 36 88 26 + 8

Adding Long Columns When a number keeps repeating use multiplication. 2 32 36 88 26 + 2 1 8