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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 373 · 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. 1.448 + 19 =
  2. 2.473 + 97 =
  3. 3.460 + 77 =
  4. 4.213 + 77 =
  5. 5.107 + 19 =
  6. 6.422 + 28 =
  7. 7.385 + 78 =
  8. 8.451 + 97 =
  9. 9.195 + 68 =
  10. 10.279 + 87 =
  11. 11.465 + 29 =
  12. 12.290 + 99 =
  13. 13.69 + 89 =
  14. 14.268 + 98 =
  15. 15.182 + 79 =
  16. 16.31 + 57 =
  17. 17.39 + 87 =
  18. 18.186 + 39 =
  19. 19.27 + 69 =
  20. 20.147 + 17 =
  21. 21.436 + 79 =
  22. 22.98 + 59 =
  23. 23.28 + 99 =
  24. 24.58 + 59 =
  25. 25.78 + 49 =
  26. 26.498 + 28 =
  27. 27.65 + 17 =
  28. 28.191 + 97 =
  29. 29.367 + 89 =
  30. 30.454 + 38 =
  31. 31.471 + 88 =
  32. 32.424 + 37 =
  33. 33.411 + 47 =
  34. 34.497 + 27 =
  35. 35.261 + 59 =
  36. 36.156 + 58 =
  37. 37.63 + 37 =
  38. 38.83 + 99 =
  39. 39.435 + 37 =
  40. 40.425 + 27 =

Answer key

  1. 467
  2. 570
  3. 537
  4. 290
  5. 126
  6. 450
  7. 463
  8. 548
  9. 263
  10. 366
  11. 494
  12. 389
  13. 158
  14. 366
  15. 261
  16. 88
  17. 126
  18. 225
  19. 96
  20. 164
  21. 515
  22. 157
  23. 127
  24. 117
  25. 127
  26. 526
  27. 82
  28. 288
  29. 456
  30. 492
  31. 559
  32. 461
  33. 458
  34. 524
  35. 320
  36. 214
  37. 100
  38. 182
  39. 472
  40. 452

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