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
- 1.47 + 11 + 36 + 68 =
- 2.81 + 64 + 46 + 51 =
- 3.67 + 86 + 30 + 46 =
- 4.86 + 47 + 89 + 35 =
- 5.18 + 76 + 70 + 32 =
- 6.27 + 13 + 27 + 77 =
- 7.57 + 51 + 88 + 47 =
- 8.87 + 52 + 84 + 45 =
- 9.66 + 83 + 27 + 13 =
- 10.81 + 54 + 69 + 53 =
- 11.32 + 27 + 45 + 84 =
- 12.45 + 45 + 31 + 89 =
- 13.28 + 35 + 15 + 73 =
- 14.13 + 70 + 43 + 47 =
- 15.55 + 48 + 31 + 46 =
- 16.65 + 34 + 35 + 31 =
- 17.69 + 58 + 65 + 41 =
- 18.45 + 47 + 28 + 86 =
- 19.51 + 11 + 89 + 49 =
- 20.41 + 50 + 63 + 25 =
- 21.65 + 82 + 48 + 32 =
- 22.19 + 40 + 20 + 80 =
- 23.26 + 44 + 27 + 68 =
- 24.19 + 89 + 59 + 45 =
- 25.48 + 28 + 88 + 24 =
- 26.41 + 28 + 68 + 70 =
- 27.13 + 56 + 47 + 52 =
- 28.52 + 32 + 31 + 16 =
- 29.71 + 24 + 73 + 89 =
- 30.20 + 78 + 58 + 20 =
- 31.34 + 66 + 53 + 72 =
- 32.11 + 84 + 19 + 66 =
- 33.29 + 53 + 82 + 56 =
- 34.45 + 28 + 36 + 88 =
- 35.76 + 25 + 27 + 16 =
- 36.68 + 43 + 73 + 48 =
- 37.77 + 30 + 23 + 13 =
- 38.49 + 69 + 22 + 52 =
- 39.72 + 51 + 81 + 75 =
- 40.32 + 37 + 80 + 22 =
Answer key
- 162
- 242
- 229
- 257
- 196
- 144
- 243
- 268
- 189
- 257
- 188
- 210
- 151
- 173
- 180
- 165
- 233
- 206
- 200
- 179
- 227
- 159
- 165
- 212
- 188
- 207
- 168
- 131
- 257
- 176
- 225
- 180
- 220
- 197
- 144
- 232
- 143
- 192
- 279
- 171
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths