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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 577 · 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. 1.376 + 77 =
  2. 2.212 + 67 =
  3. 3.99 + 18 =
  4. 4.218 + 37 =
  5. 5.287 + 27 =
  6. 6.438 + 47 =
  7. 7.35 + 58 =
  8. 8.486 + 48 =
  9. 9.322 + 57 =
  10. 10.161 + 29 =
  11. 11.68 + 17 =
  12. 12.391 + 39 =
  13. 13.124 + 47 =
  14. 14.67 + 67 =
  15. 15.123 + 28 =
  16. 16.405 + 27 =
  17. 17.423 + 87 =
  18. 18.54 + 47 =
  19. 19.481 + 29 =
  20. 20.362 + 17 =
  21. 21.234 + 47 =
  22. 22.251 + 98 =
  23. 23.195 + 47 =
  24. 24.440 + 67 =
  25. 25.204 + 29 =
  26. 26.293 + 67 =
  27. 27.239 + 89 =
  28. 28.51 + 98 =
  29. 29.55 + 97 =
  30. 30.89 + 18 =
  31. 31.333 + 59 =
  32. 32.482 + 57 =
  33. 33.265 + 89 =
  34. 34.161 + 19 =
  35. 35.235 + 29 =
  36. 36.114 + 69 =
  37. 37.265 + 78 =
  38. 38.282 + 69 =
  39. 39.29 + 69 =
  40. 40.280 + 67 =

Answer key

  1. 453
  2. 279
  3. 117
  4. 255
  5. 314
  6. 485
  7. 93
  8. 534
  9. 379
  10. 190
  11. 85
  12. 430
  13. 171
  14. 134
  15. 151
  16. 432
  17. 510
  18. 101
  19. 510
  20. 379
  21. 281
  22. 349
  23. 242
  24. 507
  25. 233
  26. 360
  27. 328
  28. 149
  29. 152
  30. 107
  31. 392
  32. 539
  33. 354
  34. 180
  35. 264
  36. 183
  37. 343
  38. 351
  39. 98
  40. 347

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