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
- 1.55 + 55 + 60 + 80 =
- 2.60 + 33 + 40 + 28 =
- 3.40 + 79 + 40 + 30 =
- 4.88 + 11 + 89 + 46 =
- 5.31 + 71 + 15 + 20 =
- 6.62 + 68 + 53 + 86 =
- 7.55 + 39 + 33 + 40 =
- 8.82 + 21 + 43 + 11 =
- 9.15 + 85 + 66 + 38 =
- 10.24 + 17 + 79 + 25 =
- 11.71 + 79 + 16 + 17 =
- 12.42 + 80 + 13 + 51 =
- 13.26 + 15 + 72 + 47 =
- 14.75 + 12 + 43 + 28 =
- 15.24 + 25 + 20 + 63 =
- 16.70 + 22 + 64 + 25 =
- 17.33 + 23 + 86 + 59 =
- 18.33 + 20 + 30 + 24 =
- 19.14 + 32 + 86 + 13 =
- 20.59 + 29 + 26 + 65 =
- 21.52 + 69 + 60 + 14 =
- 22.59 + 67 + 26 + 67 =
- 23.89 + 37 + 35 + 14 =
- 24.24 + 29 + 35 + 19 =
- 25.59 + 53 + 48 + 82 =
- 26.28 + 16 + 85 + 43 =
- 27.37 + 84 + 38 + 73 =
- 28.31 + 73 + 28 + 42 =
- 29.74 + 52 + 55 + 29 =
- 30.76 + 69 + 56 + 86 =
- 31.84 + 25 + 50 + 63 =
- 32.84 + 81 + 89 + 44 =
- 33.89 + 13 + 54 + 18 =
- 34.14 + 17 + 61 + 77 =
- 35.62 + 25 + 20 + 22 =
- 36.53 + 22 + 37 + 23 =
- 37.28 + 62 + 12 + 83 =
- 38.36 + 41 + 45 + 61 =
- 39.46 + 51 + 57 + 33 =
- 40.74 + 76 + 24 + 86 =
Answer key
- 250
- 161
- 189
- 234
- 137
- 269
- 167
- 157
- 204
- 145
- 183
- 186
- 160
- 158
- 132
- 181
- 201
- 107
- 145
- 179
- 195
- 219
- 175
- 107
- 242
- 172
- 232
- 174
- 210
- 287
- 222
- 298
- 174
- 169
- 129
- 135
- 185
- 183
- 187
- 260
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths