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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 571 · 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. 1.374 + 27 =
  2. 2.404 + 39 =
  3. 3.80 + 59 =
  4. 4.351 + 47 =
  5. 5.114 + 39 =
  6. 6.363 + 18 =
  7. 7.252 + 67 =
  8. 8.73 + 19 =
  9. 9.222 + 49 =
  10. 10.196 + 57 =
  11. 11.111 + 17 =
  12. 12.371 + 87 =
  13. 13.426 + 49 =
  14. 14.61 + 39 =
  15. 15.290 + 69 =
  16. 16.431 + 79 =
  17. 17.182 + 47 =
  18. 18.377 + 57 =
  19. 19.292 + 97 =
  20. 20.445 + 67 =
  21. 21.364 + 77 =
  22. 22.417 + 59 =
  23. 23.107 + 19 =
  24. 24.404 + 88 =
  25. 25.268 + 48 =
  26. 26.33 + 37 =
  27. 27.87 + 49 =
  28. 28.293 + 27 =
  29. 29.329 + 78 =
  30. 30.391 + 37 =
  31. 31.497 + 27 =
  32. 32.150 + 28 =
  33. 33.48 + 18 =
  34. 34.303 + 27 =
  35. 35.467 + 88 =
  36. 36.62 + 87 =
  37. 37.111 + 48 =
  38. 38.355 + 59 =
  39. 39.55 + 39 =
  40. 40.451 + 57 =

Answer key

  1. 401
  2. 443
  3. 139
  4. 398
  5. 153
  6. 381
  7. 319
  8. 92
  9. 271
  10. 253
  11. 128
  12. 458
  13. 475
  14. 100
  15. 359
  16. 510
  17. 229
  18. 434
  19. 389
  20. 512
  21. 441
  22. 476
  23. 126
  24. 492
  25. 316
  26. 70
  27. 136
  28. 320
  29. 407
  30. 428
  31. 524
  32. 178
  33. 66
  34. 330
  35. 555
  36. 149
  37. 159
  38. 414
  39. 94
  40. 508

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