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
- 1.32 + 85 + 36 + 55 =
- 2.86 + 32 + 45 + 60 =
- 3.12 + 15 + 31 + 51 =
- 4.56 + 74 + 57 + 79 =
- 5.12 + 52 + 47 + 74 =
- 6.66 + 81 + 19 + 40 =
- 7.59 + 17 + 19 + 44 =
- 8.87 + 15 + 11 + 67 =
- 9.63 + 72 + 32 + 65 =
- 10.80 + 14 + 20 + 48 =
- 11.12 + 20 + 83 + 63 =
- 12.24 + 18 + 81 + 47 =
- 13.17 + 19 + 82 + 84 =
- 14.49 + 50 + 17 + 77 =
- 15.18 + 20 + 84 + 62 =
- 16.58 + 42 + 38 + 26 =
- 17.30 + 20 + 23 + 79 =
- 18.41 + 50 + 43 + 43 =
- 19.36 + 39 + 61 + 48 =
- 20.77 + 28 + 32 + 32 =
- 21.27 + 86 + 47 + 88 =
- 22.56 + 30 + 83 + 69 =
- 23.56 + 33 + 67 + 28 =
- 24.18 + 57 + 87 + 74 =
- 25.20 + 76 + 27 + 65 =
- 26.55 + 48 + 79 + 43 =
- 27.71 + 19 + 26 + 23 =
- 28.45 + 86 + 61 + 46 =
- 29.17 + 36 + 23 + 70 =
- 30.18 + 80 + 30 + 89 =
- 31.69 + 89 + 47 + 69 =
- 32.67 + 82 + 58 + 18 =
- 33.84 + 12 + 70 + 32 =
- 34.18 + 11 + 29 + 49 =
- 35.88 + 63 + 68 + 77 =
- 36.15 + 62 + 54 + 80 =
- 37.40 + 40 + 39 + 83 =
- 38.52 + 24 + 77 + 42 =
- 39.23 + 32 + 17 + 28 =
- 40.36 + 60 + 65 + 33 =
Answer key
- 208
- 223
- 109
- 266
- 185
- 206
- 139
- 180
- 232
- 162
- 178
- 170
- 202
- 193
- 184
- 164
- 152
- 177
- 184
- 169
- 248
- 238
- 184
- 236
- 188
- 225
- 139
- 238
- 146
- 217
- 274
- 225
- 198
- 107
- 296
- 211
- 202
- 195
- 100
- 194
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths