Mental Addition and Subtraction
Related Facts
Estimating Sums and Differences
2 and 3 Digit Addition
2 and 3 Digit Subtraction
100
6 + 8 =
14
100
Related facts for the numbers 4, 5 and 9
4 + 5 = 9 5 + 4 = 9 9 - 5 = 4 9 - 4 = 5
100
67 + 13 =
70 + 10 = 80
100
46 + 39 =
85
100
86 - 29
57
200
19 - 11 =
8
200
Related facts for the numbers 13, 7 and 6
6 + 7 = 13 7 + 6 = 13 13 - 7 = 6 13 - 6 = 7
200
69 - 23 =
70 - 20 = 50
200
79 + 85 =
164
200
93 - 29
64
300
12 - 3 =
9
300
Related facts for the numbers 17, 8, and 9
8 + 9 = 17 9 + 8 = 17 17 - 8 = 9 17 - 9 = 8
300
84 - 36 =
80 - 40 = 40
300
741 + 199
940
300
586 - 297 =
289
400
17 - 9 =
8
400
Related facts for the numbers 14, 5, and 9
9 + 5 = 14 5 + 9 = 14 14 - 9 = 5 14 - 5 = 9
400
45 + 51 =
50 + 50 = 100
400
239 + 569 =
808
400
784 - 348 =
436
500
6 + 7 =
13
500
Related facts for the numbers 5, 3 and 8
5 + 3 = 8 3 + 5 = 8 8 - 5 = 3 8 - 3 = 5
500
94 - 78 =
90 - 80 = 10
500
497 + 396
893
500
232 - 188
44
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