Mental Addition Worksheet
The fast method (Keep a running total): Start with the first number. Add the tens of the next number, then its ones. Keep going until the list ends — only one total in your head at a time.
NameDateTime takenScore ___ / 40
- 1.70 + 71 + 11 + 42 =
- 2.84 + 80 + 82 + 70 =
- 3.74 + 31 + 15 + 52 =
- 4.58 + 73 + 15 + 72 =
- 5.20 + 54 + 14 + 46 =
- 6.66 + 56 + 88 + 38 =
- 7.81 + 25 + 43 + 64 =
- 8.72 + 83 + 30 + 27 =
- 9.42 + 30 + 16 + 17 =
- 10.58 + 74 + 79 + 28 =
- 11.68 + 63 + 57 + 14 =
- 12.66 + 55 + 46 + 18 =
- 13.24 + 71 + 48 + 19 =
- 14.23 + 72 + 88 + 21 =
- 15.32 + 32 + 39 + 35 =
- 16.58 + 13 + 76 + 15 =
- 17.72 + 17 + 53 + 87 =
- 18.19 + 44 + 28 + 28 =
- 19.28 + 36 + 22 + 13 =
- 20.23 + 37 + 50 + 76 =
- 21.57 + 13 + 54 + 14 =
- 22.54 + 15 + 18 + 80 =
- 23.39 + 33 + 57 + 25 =
- 24.47 + 23 + 80 + 18 =
- 25.31 + 76 + 76 + 19 =
- 26.47 + 81 + 44 + 21 =
- 27.66 + 69 + 16 + 33 =
- 28.46 + 72 + 40 + 22 =
- 29.59 + 20 + 27 + 77 =
- 30.41 + 80 + 78 + 64 =
- 31.64 + 12 + 76 + 45 =
- 32.36 + 34 + 50 + 55 =
- 33.16 + 77 + 15 + 73 =
- 34.88 + 42 + 16 + 39 =
- 35.24 + 48 + 77 + 22 =
- 36.23 + 23 + 84 + 70 =
- 37.32 + 18 + 77 + 30 =
- 38.15 + 89 + 78 + 42 =
- 39.57 + 46 + 68 + 85 =
- 40.69 + 86 + 65 + 49 =
Answer key
- 194
- 316
- 172
- 218
- 134
- 248
- 213
- 212
- 105
- 239
- 202
- 185
- 162
- 204
- 138
- 162
- 229
- 119
- 99
- 186
- 138
- 167
- 154
- 168
- 202
- 193
- 184
- 180
- 183
- 263
- 197
- 175
- 181
- 185
- 171
- 200
- 157
- 224
- 256
- 269
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths