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
- 1.20 + 24 + 59 + 36 =
- 2.67 + 79 + 34 + 45 =
- 3.87 + 36 + 60 + 15 =
- 4.49 + 50 + 69 + 39 =
- 5.45 + 83 + 33 + 56 =
- 6.85 + 21 + 44 + 13 =
- 7.63 + 81 + 14 + 60 =
- 8.77 + 33 + 43 + 51 =
- 9.68 + 83 + 60 + 83 =
- 10.17 + 21 + 82 + 47 =
- 11.53 + 30 + 75 + 11 =
- 12.13 + 11 + 27 + 43 =
- 13.20 + 88 + 14 + 87 =
- 14.23 + 80 + 26 + 30 =
- 15.69 + 15 + 55 + 19 =
- 16.39 + 30 + 83 + 61 =
- 17.76 + 15 + 68 + 83 =
- 18.70 + 32 + 70 + 43 =
- 19.42 + 59 + 80 + 69 =
- 20.66 + 37 + 48 + 25 =
- 21.61 + 35 + 51 + 70 =
- 22.61 + 11 + 49 + 32 =
- 23.31 + 62 + 18 + 21 =
- 24.78 + 45 + 88 + 86 =
- 25.55 + 37 + 34 + 20 =
- 26.20 + 36 + 19 + 30 =
- 27.51 + 15 + 40 + 64 =
- 28.86 + 12 + 53 + 34 =
- 29.12 + 75 + 89 + 33 =
- 30.60 + 57 + 18 + 25 =
- 31.60 + 12 + 86 + 23 =
- 32.24 + 80 + 53 + 74 =
- 33.11 + 46 + 56 + 75 =
- 34.22 + 18 + 67 + 77 =
- 35.19 + 14 + 79 + 66 =
- 36.67 + 67 + 55 + 39 =
- 37.56 + 64 + 66 + 15 =
- 38.57 + 89 + 69 + 23 =
- 39.84 + 46 + 66 + 14 =
- 40.88 + 86 + 82 + 74 =
Answer key
- 139
- 225
- 198
- 207
- 217
- 163
- 218
- 204
- 294
- 167
- 169
- 94
- 209
- 159
- 158
- 213
- 242
- 215
- 250
- 176
- 217
- 153
- 132
- 297
- 146
- 105
- 170
- 185
- 209
- 160
- 181
- 231
- 188
- 184
- 178
- 228
- 201
- 238
- 210
- 330
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths