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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 103 · 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. 1.132 + 38 =
  2. 2.70 + 59 =
  3. 3.200 + 79 =
  4. 4.130 + 19 =
  5. 5.376 + 48 =
  6. 6.47 + 38 =
  7. 7.234 + 77 =
  8. 8.407 + 48 =
  9. 9.222 + 67 =
  10. 10.427 + 69 =
  11. 11.452 + 49 =
  12. 12.129 + 87 =
  13. 13.117 + 78 =
  14. 14.459 + 78 =
  15. 15.124 + 69 =
  16. 16.57 + 37 =
  17. 17.219 + 68 =
  18. 18.213 + 59 =
  19. 19.140 + 28 =
  20. 20.290 + 59 =
  21. 21.165 + 37 =
  22. 22.51 + 69 =
  23. 23.446 + 87 =
  24. 24.429 + 68 =
  25. 25.411 + 59 =
  26. 26.62 + 67 =
  27. 27.109 + 47 =
  28. 28.31 + 99 =
  29. 29.385 + 78 =
  30. 30.201 + 79 =
  31. 31.48 + 78 =
  32. 32.447 + 28 =
  33. 33.217 + 99 =
  34. 34.375 + 57 =
  35. 35.324 + 27 =
  36. 36.26 + 67 =
  37. 37.442 + 98 =
  38. 38.115 + 97 =
  39. 39.441 + 37 =
  40. 40.198 + 28 =

Answer key

  1. 170
  2. 129
  3. 279
  4. 149
  5. 424
  6. 85
  7. 311
  8. 455
  9. 289
  10. 496
  11. 501
  12. 216
  13. 195
  14. 537
  15. 193
  16. 94
  17. 287
  18. 272
  19. 168
  20. 349
  21. 202
  22. 120
  23. 533
  24. 497
  25. 470
  26. 129
  27. 156
  28. 130
  29. 463
  30. 280
  31. 126
  32. 475
  33. 316
  34. 432
  35. 351
  36. 93
  37. 540
  38. 212
  39. 478
  40. 226

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