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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 97 · 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. 1.207 + 29 =
  2. 2.369 + 18 =
  3. 3.426 + 69 =
  4. 4.477 + 57 =
  5. 5.356 + 47 =
  6. 6.469 + 77 =
  7. 7.218 + 67 =
  8. 8.137 + 79 =
  9. 9.338 + 29 =
  10. 10.213 + 47 =
  11. 11.256 + 29 =
  12. 12.137 + 49 =
  13. 13.491 + 67 =
  14. 14.388 + 49 =
  15. 15.460 + 39 =
  16. 16.345 + 37 =
  17. 17.40 + 79 =
  18. 18.83 + 48 =
  19. 19.237 + 18 =
  20. 20.48 + 39 =
  21. 21.84 + 48 =
  22. 22.246 + 59 =
  23. 23.133 + 98 =
  24. 24.202 + 18 =
  25. 25.32 + 58 =
  26. 26.443 + 88 =
  27. 27.466 + 77 =
  28. 28.445 + 47 =
  29. 29.313 + 17 =
  30. 30.350 + 89 =
  31. 31.258 + 49 =
  32. 32.78 + 57 =
  33. 33.64 + 58 =
  34. 34.86 + 39 =
  35. 35.85 + 58 =
  36. 36.458 + 39 =
  37. 37.55 + 17 =
  38. 38.140 + 19 =
  39. 39.315 + 39 =
  40. 40.399 + 49 =

Answer key

  1. 236
  2. 387
  3. 495
  4. 534
  5. 403
  6. 546
  7. 285
  8. 216
  9. 367
  10. 260
  11. 285
  12. 186
  13. 558
  14. 437
  15. 499
  16. 382
  17. 119
  18. 131
  19. 255
  20. 87
  21. 132
  22. 305
  23. 231
  24. 220
  25. 90
  26. 531
  27. 543
  28. 492
  29. 330
  30. 439
  31. 307
  32. 135
  33. 122
  34. 125
  35. 143
  36. 497
  37. 72
  38. 159
  39. 354
  40. 448

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