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# Shortcuts in Addition - PowerPoint PPT Presentation

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.

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Presentation Transcript

By Monica Yuskaitis

• Since addition is Commutative it doesn’t matter which numbers you add first.

4 + 2 + 5 + 1 = 12

1 + 4 + 5 + 2 = 12

• Begin by looking for combinations of ten.

34

57

83

26

+

2

34

57

83

26

+

0

34

57

83

26

2

+

2 0

0

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

• When a number keeps repeating use multiplication.

2

32

36

88

26

36

+

8

• When a number keeps repeating use multiplication.

2

32

36

88

26

36

+

2 1

8