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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 237 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.198 + 57 =
  2. 2.202 + 19 =
  3. 3.121 + 99 =
  4. 4.170 + 49 =
  5. 5.210 + 79 =
  6. 6.144 + 28 =
  7. 7.282 + 87 =
  8. 8.366 + 49 =
  9. 9.167 + 87 =
  10. 10.212 + 28 =
  11. 11.173 + 79 =
  12. 12.256 + 59 =
  13. 13.51 + 29 =
  14. 14.367 + 98 =
  15. 15.91 + 37 =
  16. 16.366 + 67 =
  17. 17.472 + 98 =
  18. 18.402 + 87 =
  19. 19.149 + 49 =
  20. 20.250 + 37 =
  21. 21.261 + 89 =
  22. 22.118 + 67 =
  23. 23.136 + 29 =
  24. 24.161 + 98 =
  25. 25.221 + 99 =
  26. 26.235 + 87 =
  27. 27.139 + 98 =
  28. 28.262 + 28 =
  29. 29.489 + 17 =
  30. 30.148 + 18 =
  31. 31.258 + 87 =
  32. 32.402 + 58 =
  33. 33.420 + 38 =
  34. 34.474 + 17 =
  35. 35.356 + 18 =
  36. 36.182 + 47 =
  37. 37.95 + 67 =
  38. 38.36 + 98 =
  39. 39.338 + 28 =
  40. 40.48 + 68 =

Answer key

  1. 255
  2. 221
  3. 220
  4. 219
  5. 289
  6. 172
  7. 369
  8. 415
  9. 254
  10. 240
  11. 252
  12. 315
  13. 80
  14. 465
  15. 128
  16. 433
  17. 570
  18. 489
  19. 198
  20. 287
  21. 350
  22. 185
  23. 165
  24. 259
  25. 320
  26. 322
  27. 237
  28. 290
  29. 506
  30. 166
  31. 345
  32. 460
  33. 458
  34. 491
  35. 374
  36. 229
  37. 162
  38. 134
  39. 366
  40. 116

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