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
- 1.37 + 47 + 33 + 57 =
- 2.49 + 17 + 19 + 68 =
- 3.86 + 77 + 87 + 34 =
- 4.21 + 75 + 25 + 52 =
- 5.78 + 88 + 13 + 51 =
- 6.52 + 41 + 80 + 82 =
- 7.24 + 74 + 29 + 74 =
- 8.39 + 55 + 40 + 56 =
- 9.87 + 29 + 38 + 73 =
- 10.77 + 44 + 79 + 41 =
- 11.22 + 85 + 68 + 49 =
- 12.16 + 31 + 23 + 89 =
- 13.47 + 23 + 85 + 56 =
- 14.44 + 82 + 44 + 55 =
- 15.80 + 88 + 70 + 36 =
- 16.77 + 75 + 37 + 34 =
- 17.57 + 28 + 23 + 34 =
- 18.18 + 18 + 57 + 26 =
- 19.83 + 23 + 27 + 57 =
- 20.28 + 36 + 50 + 54 =
- 21.80 + 64 + 49 + 63 =
- 22.13 + 35 + 25 + 26 =
- 23.84 + 62 + 33 + 77 =
- 24.40 + 23 + 53 + 11 =
- 25.61 + 29 + 56 + 76 =
- 26.32 + 50 + 59 + 12 =
- 27.52 + 84 + 33 + 28 =
- 28.73 + 21 + 53 + 82 =
- 29.54 + 52 + 61 + 45 =
- 30.31 + 40 + 56 + 65 =
- 31.15 + 46 + 28 + 21 =
- 32.14 + 44 + 75 + 66 =
- 33.70 + 77 + 82 + 20 =
- 34.24 + 46 + 67 + 38 =
- 35.43 + 64 + 12 + 29 =
- 36.29 + 47 + 46 + 19 =
- 37.17 + 34 + 75 + 24 =
- 38.19 + 52 + 53 + 56 =
- 39.20 + 63 + 49 + 42 =
- 40.30 + 73 + 42 + 18 =
Answer key
- 174
- 153
- 284
- 173
- 230
- 255
- 201
- 190
- 227
- 241
- 224
- 159
- 211
- 225
- 274
- 223
- 142
- 119
- 190
- 168
- 256
- 99
- 256
- 127
- 222
- 153
- 197
- 229
- 212
- 192
- 110
- 199
- 249
- 175
- 148
- 141
- 150
- 180
- 174
- 163
Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths