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
- 1.23 + 33 + 44 + 16 =
- 2.68 + 56 + 24 + 64 =
- 3.63 + 53 + 41 + 72 =
- 4.71 + 35 + 46 + 62 =
- 5.13 + 76 + 88 + 47 =
- 6.34 + 57 + 57 + 63 =
- 7.39 + 50 + 78 + 14 =
- 8.50 + 52 + 58 + 56 =
- 9.40 + 58 + 65 + 16 =
- 10.37 + 89 + 43 + 24 =
- 11.22 + 83 + 60 + 72 =
- 12.22 + 84 + 64 + 30 =
- 13.23 + 89 + 20 + 82 =
- 14.66 + 54 + 66 + 30 =
- 15.77 + 39 + 21 + 28 =
- 16.18 + 45 + 62 + 49 =
- 17.88 + 75 + 84 + 80 =
- 18.64 + 79 + 84 + 42 =
- 19.79 + 47 + 78 + 76 =
- 20.22 + 54 + 35 + 57 =
- 21.30 + 40 + 35 + 62 =
- 22.61 + 29 + 78 + 12 =
- 23.77 + 50 + 83 + 11 =
- 24.85 + 69 + 85 + 22 =
- 25.40 + 85 + 77 + 25 =
- 26.16 + 25 + 50 + 82 =
- 27.11 + 50 + 39 + 16 =
- 28.81 + 57 + 85 + 26 =
- 29.51 + 39 + 24 + 28 =
- 30.69 + 74 + 34 + 55 =
- 31.69 + 14 + 31 + 31 =
- 32.35 + 16 + 60 + 32 =
- 33.50 + 64 + 44 + 27 =
- 34.76 + 56 + 28 + 60 =
- 35.30 + 86 + 32 + 68 =
- 36.52 + 59 + 41 + 48 =
- 37.25 + 12 + 89 + 41 =
- 38.79 + 40 + 25 + 34 =
- 39.60 + 26 + 23 + 28 =
- 40.67 + 74 + 13 + 12 =
Answer key
- 116
- 212
- 229
- 214
- 224
- 211
- 181
- 216
- 179
- 193
- 237
- 200
- 214
- 216
- 165
- 174
- 327
- 269
- 280
- 168
- 167
- 180
- 221
- 261
- 227
- 173
- 116
- 249
- 142
- 232
- 145
- 143
- 185
- 220
- 216
- 200
- 167
- 178
- 137
- 166
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths