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Learn how to streamline long column addition with helpful techniques and shortcuts. Understand the concept of commutativity and utilizing combinations of ten for faster calculations. Practice with examples and master multiplication to speed up repetitive additions.
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Shortcuts in Addition By Monica Yuskaitis
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 +
Adding Long Columns • Add up your ten combinations first. 2 34 57 83 26 + 0
Adding Long Columns • Add up your ten combinations again. 34 57 83 26 2 + 2 0 0
Review Combinations of Ten 9 5 • 1 + = 10 5 + = 10 • 8 + = 10 7 + = 10 • 2 + = 10 6 + = 10 • 4 + = 10 3 + = 10 • 9 + =10 2 3 8 4 6 7 1
Adding Long Columns • When a number keeps repeating use multiplication. 2 32 36 88 26 36 + 8
Adding Long Columns • When a number keeps repeating use multiplication. 2 32 36 88 26 36 + 2 1 8
