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 + 16 + 45 + 62 =
- 2.11 + 62 + 27 + 85 =
- 3.21 + 84 + 38 + 55 =
- 4.31 + 46 + 17 + 20 =
- 5.49 + 67 + 77 + 54 =
- 6.88 + 23 + 59 + 82 =
- 7.58 + 49 + 49 + 66 =
- 8.38 + 18 + 23 + 70 =
- 9.39 + 50 + 30 + 64 =
- 10.25 + 40 + 34 + 60 =
- 11.49 + 27 + 27 + 74 =
- 12.64 + 66 + 21 + 55 =
- 13.44 + 35 + 61 + 54 =
- 14.24 + 81 + 75 + 68 =
- 15.38 + 49 + 77 + 16 =
- 16.85 + 43 + 51 + 69 =
- 17.57 + 69 + 11 + 57 =
- 18.44 + 57 + 62 + 13 =
- 19.71 + 39 + 35 + 38 =
- 20.47 + 58 + 59 + 55 =
- 21.19 + 70 + 85 + 33 =
- 22.34 + 76 + 26 + 20 =
- 23.49 + 78 + 64 + 70 =
- 24.20 + 22 + 56 + 89 =
- 25.28 + 58 + 18 + 55 =
- 26.86 + 59 + 53 + 41 =
- 27.28 + 19 + 50 + 29 =
- 28.54 + 46 + 44 + 60 =
- 29.43 + 50 + 78 + 62 =
- 30.78 + 77 + 71 + 31 =
- 31.48 + 59 + 39 + 61 =
- 32.21 + 45 + 19 + 68 =
- 33.35 + 55 + 54 + 66 =
- 34.36 + 29 + 17 + 56 =
- 35.41 + 59 + 66 + 14 =
- 36.83 + 67 + 43 + 31 =
- 37.83 + 26 + 74 + 74 =
- 38.81 + 35 + 60 + 25 =
- 39.40 + 29 + 63 + 46 =
- 40.54 + 52 + 31 + 23 =
Answer key
- 155
- 185
- 198
- 114
- 247
- 252
- 222
- 149
- 183
- 159
- 177
- 206
- 194
- 248
- 180
- 248
- 194
- 176
- 183
- 219
- 207
- 156
- 261
- 187
- 159
- 239
- 126
- 204
- 233
- 257
- 207
- 153
- 210
- 138
- 180
- 224
- 257
- 201
- 178
- 160
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths