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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 389 · 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. 1.433 + 37 =
  2. 2.217 + 89 =
  3. 3.291 + 99 =
  4. 4.86 + 97 =
  5. 5.138 + 87 =
  6. 6.46 + 67 =
  7. 7.279 + 67 =
  8. 8.392 + 58 =
  9. 9.36 + 87 =
  10. 10.81 + 57 =
  11. 11.139 + 38 =
  12. 12.329 + 39 =
  13. 13.380 + 18 =
  14. 14.25 + 49 =
  15. 15.327 + 78 =
  16. 16.62 + 79 =
  17. 17.412 + 78 =
  18. 18.53 + 99 =
  19. 19.154 + 37 =
  20. 20.69 + 67 =
  21. 21.337 + 47 =
  22. 22.372 + 88 =
  23. 23.275 + 17 =
  24. 24.68 + 69 =
  25. 25.284 + 18 =
  26. 26.34 + 98 =
  27. 27.321 + 18 =
  28. 28.444 + 37 =
  29. 29.83 + 17 =
  30. 30.482 + 57 =
  31. 31.87 + 27 =
  32. 32.474 + 89 =
  33. 33.332 + 49 =
  34. 34.138 + 79 =
  35. 35.401 + 38 =
  36. 36.319 + 89 =
  37. 37.311 + 69 =
  38. 38.114 + 79 =
  39. 39.97 + 19 =
  40. 40.298 + 17 =

Answer key

  1. 470
  2. 306
  3. 390
  4. 183
  5. 225
  6. 113
  7. 346
  8. 450
  9. 123
  10. 138
  11. 177
  12. 368
  13. 398
  14. 74
  15. 405
  16. 141
  17. 490
  18. 152
  19. 191
  20. 136
  21. 384
  22. 460
  23. 292
  24. 137
  25. 302
  26. 132
  27. 339
  28. 481
  29. 100
  30. 539
  31. 114
  32. 563
  33. 381
  34. 217
  35. 439
  36. 408
  37. 380
  38. 193
  39. 116
  40. 315

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