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Shortcuts in Addition By Monica Yuskaitis

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Adding Long Columns Since addition is Commutative it doesnt matter which numbers you add first. 4 + 2 + 5 + 1 = 12 1 + 4 + 5 + 2 =

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

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

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

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

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

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

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Fraction XII Subtracting Unlike Denominators

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