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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 84 · 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. 1.411 + 37 =
  2. 2.388 + 97 =
  3. 3.434 + 87 =
  4. 4.68 + 29 =
  5. 5.44 + 37 =
  6. 6.45 + 79 =
  7. 7.365 + 98 =
  8. 8.373 + 57 =
  9. 9.474 + 89 =
  10. 10.363 + 39 =
  11. 11.382 + 57 =
  12. 12.272 + 97 =
  13. 13.405 + 87 =
  14. 14.440 + 77 =
  15. 15.254 + 97 =
  16. 16.346 + 17 =
  17. 17.115 + 28 =
  18. 18.90 + 29 =
  19. 19.467 + 47 =
  20. 20.135 + 99 =
  21. 21.382 + 29 =
  22. 22.155 + 17 =
  23. 23.207 + 67 =
  24. 24.337 + 69 =
  25. 25.341 + 49 =
  26. 26.59 + 18 =
  27. 27.488 + 18 =
  28. 28.112 + 29 =
  29. 29.212 + 69 =
  30. 30.423 + 27 =
  31. 31.419 + 18 =
  32. 32.95 + 77 =
  33. 33.326 + 77 =
  34. 34.55 + 58 =
  35. 35.113 + 57 =
  36. 36.488 + 57 =
  37. 37.459 + 87 =
  38. 38.164 + 57 =
  39. 39.146 + 17 =
  40. 40.173 + 87 =

Answer key

  1. 448
  2. 485
  3. 521
  4. 97
  5. 81
  6. 124
  7. 463
  8. 430
  9. 563
  10. 402
  11. 439
  12. 369
  13. 492
  14. 517
  15. 351
  16. 363
  17. 143
  18. 119
  19. 514
  20. 234
  21. 411
  22. 172
  23. 274
  24. 406
  25. 390
  26. 77
  27. 506
  28. 141
  29. 281
  30. 450
  31. 437
  32. 172
  33. 403
  34. 113
  35. 170
  36. 545
  37. 546
  38. 221
  39. 163
  40. 260

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