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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 714 · 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. 1.336 + 58 =
  2. 2.438 + 59 =
  3. 3.338 + 19 =
  4. 4.143 + 47 =
  5. 5.163 + 19 =
  6. 6.158 + 37 =
  7. 7.190 + 18 =
  8. 8.229 + 58 =
  9. 9.274 + 17 =
  10. 10.87 + 17 =
  11. 11.29 + 29 =
  12. 12.296 + 79 =
  13. 13.86 + 77 =
  14. 14.431 + 47 =
  15. 15.91 + 87 =
  16. 16.170 + 17 =
  17. 17.25 + 19 =
  18. 18.244 + 57 =
  19. 19.112 + 28 =
  20. 20.216 + 17 =
  21. 21.57 + 97 =
  22. 22.343 + 68 =
  23. 23.276 + 87 =
  24. 24.185 + 68 =
  25. 25.218 + 18 =
  26. 26.475 + 59 =
  27. 27.497 + 69 =
  28. 28.363 + 57 =
  29. 29.360 + 18 =
  30. 30.416 + 27 =
  31. 31.462 + 69 =
  32. 32.251 + 37 =
  33. 33.258 + 29 =
  34. 34.429 + 17 =
  35. 35.344 + 97 =
  36. 36.389 + 39 =
  37. 37.475 + 88 =
  38. 38.396 + 29 =
  39. 39.219 + 67 =
  40. 40.268 + 67 =

Answer key

  1. 394
  2. 497
  3. 357
  4. 190
  5. 182
  6. 195
  7. 208
  8. 287
  9. 291
  10. 104
  11. 58
  12. 375
  13. 163
  14. 478
  15. 178
  16. 187
  17. 44
  18. 301
  19. 140
  20. 233
  21. 154
  22. 411
  23. 363
  24. 253
  25. 236
  26. 534
  27. 566
  28. 420
  29. 378
  30. 443
  31. 531
  32. 288
  33. 287
  34. 446
  35. 441
  36. 428
  37. 563
  38. 425
  39. 286
  40. 335

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