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
- 1.40 + 42 + 73 + 75 =
- 2.61 + 47 + 71 + 62 =
- 3.15 + 86 + 27 + 15 =
- 4.14 + 35 + 86 + 88 =
- 5.16 + 83 + 73 + 71 =
- 6.27 + 46 + 31 + 22 =
- 7.50 + 55 + 54 + 11 =
- 8.25 + 87 + 24 + 20 =
- 9.77 + 16 + 25 + 65 =
- 10.32 + 87 + 36 + 56 =
- 11.73 + 30 + 26 + 58 =
- 12.38 + 88 + 20 + 34 =
- 13.70 + 82 + 67 + 23 =
- 14.76 + 68 + 19 + 46 =
- 15.71 + 46 + 70 + 61 =
- 16.19 + 22 + 82 + 44 =
- 17.33 + 26 + 89 + 54 =
- 18.68 + 82 + 24 + 67 =
- 19.49 + 63 + 88 + 29 =
- 20.40 + 76 + 24 + 77 =
- 21.82 + 21 + 42 + 64 =
- 22.40 + 23 + 84 + 71 =
- 23.33 + 30 + 19 + 40 =
- 24.51 + 29 + 13 + 25 =
- 25.26 + 72 + 33 + 34 =
- 26.36 + 20 + 35 + 38 =
- 27.39 + 29 + 60 + 31 =
- 28.65 + 63 + 68 + 75 =
- 29.26 + 28 + 17 + 79 =
- 30.25 + 22 + 33 + 56 =
- 31.88 + 41 + 58 + 59 =
- 32.31 + 28 + 72 + 27 =
- 33.37 + 38 + 13 + 42 =
- 34.17 + 62 + 70 + 19 =
- 35.65 + 25 + 81 + 84 =
- 36.31 + 40 + 50 + 89 =
- 37.62 + 77 + 62 + 89 =
- 38.66 + 42 + 47 + 55 =
- 39.32 + 53 + 42 + 16 =
- 40.57 + 23 + 33 + 60 =
Answer key
- 230
- 241
- 143
- 223
- 243
- 126
- 170
- 156
- 183
- 211
- 187
- 180
- 242
- 209
- 248
- 167
- 202
- 241
- 229
- 217
- 209
- 218
- 122
- 118
- 165
- 129
- 159
- 271
- 150
- 136
- 246
- 158
- 130
- 168
- 255
- 210
- 290
- 210
- 143
- 173
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths