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
- 1.86 + 66 + 66 + 13 =
- 2.31 + 53 + 17 + 47 =
- 3.43 + 22 + 33 + 32 =
- 4.22 + 64 + 81 + 88 =
- 5.63 + 67 + 46 + 53 =
- 6.29 + 58 + 57 + 36 =
- 7.24 + 83 + 38 + 23 =
- 8.31 + 66 + 33 + 25 =
- 9.14 + 62 + 60 + 31 =
- 10.51 + 23 + 84 + 46 =
- 11.50 + 13 + 11 + 86 =
- 12.57 + 19 + 70 + 73 =
- 13.18 + 61 + 52 + 67 =
- 14.72 + 11 + 66 + 70 =
- 15.78 + 17 + 14 + 57 =
- 16.34 + 16 + 37 + 27 =
- 17.43 + 25 + 58 + 64 =
- 18.35 + 28 + 11 + 53 =
- 19.26 + 29 + 24 + 57 =
- 20.35 + 75 + 57 + 68 =
- 21.19 + 22 + 73 + 53 =
- 22.81 + 14 + 66 + 89 =
- 23.78 + 54 + 58 + 20 =
- 24.57 + 51 + 14 + 21 =
- 25.27 + 87 + 42 + 13 =
- 26.36 + 57 + 25 + 39 =
- 27.26 + 45 + 78 + 55 =
- 28.12 + 51 + 27 + 39 =
- 29.25 + 20 + 60 + 23 =
- 30.33 + 20 + 83 + 20 =
- 31.19 + 82 + 71 + 40 =
- 32.51 + 65 + 50 + 80 =
- 33.58 + 31 + 44 + 55 =
- 34.16 + 22 + 58 + 33 =
- 35.55 + 33 + 71 + 41 =
- 36.40 + 43 + 82 + 48 =
- 37.67 + 20 + 68 + 48 =
- 38.20 + 15 + 87 + 31 =
- 39.66 + 73 + 84 + 23 =
- 40.86 + 74 + 71 + 21 =
Answer key
- 231
- 148
- 130
- 255
- 229
- 180
- 168
- 155
- 167
- 204
- 160
- 219
- 198
- 219
- 166
- 114
- 190
- 127
- 136
- 235
- 167
- 250
- 210
- 143
- 169
- 157
- 204
- 129
- 128
- 156
- 212
- 246
- 188
- 129
- 200
- 213
- 203
- 153
- 246
- 252
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths