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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 727 · 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. 1.218 + 19 =
  2. 2.471 + 58 =
  3. 3.91 + 17 =
  4. 4.75 + 97 =
  5. 5.403 + 39 =
  6. 6.496 + 87 =
  7. 7.445 + 19 =
  8. 8.421 + 28 =
  9. 9.161 + 17 =
  10. 10.317 + 18 =
  11. 11.318 + 78 =
  12. 12.159 + 57 =
  13. 13.80 + 18 =
  14. 14.319 + 67 =
  15. 15.52 + 89 =
  16. 16.423 + 37 =
  17. 17.49 + 58 =
  18. 18.148 + 88 =
  19. 19.459 + 59 =
  20. 20.169 + 18 =
  21. 21.321 + 27 =
  22. 22.128 + 77 =
  23. 23.492 + 89 =
  24. 24.116 + 18 =
  25. 25.121 + 68 =
  26. 26.148 + 18 =
  27. 27.209 + 29 =
  28. 28.402 + 37 =
  29. 29.289 + 59 =
  30. 30.116 + 48 =
  31. 31.384 + 97 =
  32. 32.466 + 98 =
  33. 33.430 + 98 =
  34. 34.106 + 59 =
  35. 35.303 + 87 =
  36. 36.314 + 49 =
  37. 37.346 + 29 =
  38. 38.349 + 78 =
  39. 39.389 + 19 =
  40. 40.475 + 77 =

Answer key

  1. 237
  2. 529
  3. 108
  4. 172
  5. 442
  6. 583
  7. 464
  8. 449
  9. 178
  10. 335
  11. 396
  12. 216
  13. 98
  14. 386
  15. 141
  16. 460
  17. 107
  18. 236
  19. 518
  20. 187
  21. 348
  22. 205
  23. 581
  24. 134
  25. 189
  26. 166
  27. 238
  28. 439
  29. 348
  30. 164
  31. 481
  32. 564
  33. 528
  34. 165
  35. 390
  36. 363
  37. 375
  38. 427
  39. 408
  40. 552

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