Shortcuts in Addition

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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 12
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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.

2
34 57 83 26

0
5
Adding Long Columns

• Add up your ten combinations again.

34 57 83 26
2

0
2 0
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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
7
Adding Long Columns

• When a number keeps repeating use multiplication.

2
32 36 88 26 36

8
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Adding Long Columns

• When a number keeps repeating use multiplication.

2
32 36 88 26 36

8
2 1