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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