Numbers

2-51 Addition and Subtraction Patterns

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Another way to add or subtract in your head is to think of a math fact that you already know.

For example, 7 + 5 = 12.  Look at the table below.  Look for the pattern.

 

  7 + 5 = 12

Read each column down.

14 - 5 = 9
17 + 5 = 22 24 - 5 = 19
27 + 5 = 32 34 - 5 = 29
37 + 5 = 42 44 - 5 = 39
47 + 5 = 52 54 - 5 = 49
57 + 5 = 62 64 - 5 = 59
67 + 5 = 72 74 - 5 = 69
77 + 5 = 82 84 - 5 = 79
87 + 5 = 92 94 - 5 = 89

 

Solve the patterns below.

 

 6 + 7 = 13 16 + 7 = 26 + 7 = 36 + 7 =
56 + 7 = 66 + 7 = 76 + 7 = 86 + 7 =
8 + 7 = 15 18 + 7 = 28 + 7 = 38 + 7 =
58 + 7 = 68 + 7 = 78 + 7 = 88 + 7 =
9 + 6 = 19 + 6 = 29 + 6 = 39 + 6 =
4 + 9 = 13 + 9 = 23 + 9 = 33 + 9 = 43
3 + 8 = 11 + 8 = 21 + 8 = 31 + 8 = 41
59 + 7 = 66 + 7 = 76 79 + 7 = + 7 = 96
16 + 7 = 26 + 7 = 36 + 7 = 46 + 7 =
+ 9 = 53 + 9 = 63 64 + 9 = 74 + 9 =

 

 

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