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
- 1.38 + 78 + 11 + 87 =
- 2.81 + 78 + 74 + 30 =
- 3.26 + 81 + 25 + 84 =
- 4.45 + 12 + 16 + 28 =
- 5.49 + 48 + 53 + 32 =
- 6.75 + 15 + 13 + 47 =
- 7.79 + 58 + 52 + 57 =
- 8.79 + 87 + 41 + 46 =
- 9.15 + 83 + 40 + 59 =
- 10.62 + 18 + 74 + 30 =
- 11.50 + 51 + 30 + 28 =
- 12.60 + 19 + 59 + 62 =
- 13.54 + 27 + 11 + 81 =
- 14.49 + 50 + 59 + 77 =
- 15.20 + 73 + 72 + 31 =
- 16.29 + 63 + 62 + 63 =
- 17.89 + 86 + 68 + 80 =
- 18.73 + 58 + 14 + 52 =
- 19.56 + 43 + 29 + 33 =
- 20.67 + 76 + 13 + 76 =
- 21.22 + 14 + 12 + 51 =
- 22.78 + 88 + 51 + 26 =
- 23.58 + 52 + 39 + 36 =
- 24.69 + 41 + 20 + 54 =
- 25.31 + 75 + 26 + 32 =
- 26.16 + 21 + 35 + 66 =
- 27.48 + 31 + 52 + 12 =
- 28.40 + 18 + 37 + 33 =
- 29.86 + 34 + 60 + 42 =
- 30.47 + 67 + 85 + 82 =
- 31.37 + 30 + 54 + 54 =
- 32.65 + 25 + 23 + 65 =
- 33.39 + 13 + 74 + 76 =
- 34.68 + 82 + 82 + 80 =
- 35.58 + 27 + 42 + 89 =
- 36.76 + 41 + 18 + 18 =
- 37.56 + 28 + 84 + 20 =
- 38.38 + 34 + 20 + 75 =
- 39.29 + 56 + 24 + 18 =
- 40.32 + 75 + 18 + 57 =
Answer key
- 214
- 263
- 216
- 101
- 182
- 150
- 246
- 253
- 197
- 184
- 159
- 200
- 173
- 235
- 196
- 217
- 323
- 197
- 161
- 232
- 99
- 243
- 185
- 184
- 164
- 138
- 143
- 128
- 222
- 281
- 175
- 178
- 202
- 312
- 216
- 153
- 188
- 167
- 127
- 182
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths