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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 71 · 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. 1.226 + 37 =
  2. 2.299 + 77 =
  3. 3.419 + 88 =
  4. 4.424 + 28 =
  5. 5.221 + 57 =
  6. 6.140 + 98 =
  7. 7.235 + 17 =
  8. 8.413 + 87 =
  9. 9.314 + 48 =
  10. 10.498 + 67 =
  11. 11.142 + 87 =
  12. 12.389 + 37 =
  13. 13.465 + 27 =
  14. 14.39 + 58 =
  15. 15.117 + 27 =
  16. 16.415 + 89 =
  17. 17.45 + 29 =
  18. 18.410 + 78 =
  19. 19.297 + 48 =
  20. 20.376 + 28 =
  21. 21.408 + 89 =
  22. 22.397 + 99 =
  23. 23.193 + 59 =
  24. 24.60 + 97 =
  25. 25.286 + 77 =
  26. 26.128 + 69 =
  27. 27.435 + 37 =
  28. 28.243 + 79 =
  29. 29.100 + 18 =
  30. 30.235 + 59 =
  31. 31.294 + 17 =
  32. 32.489 + 89 =
  33. 33.80 + 29 =
  34. 34.297 + 98 =
  35. 35.139 + 77 =
  36. 36.26 + 99 =
  37. 37.78 + 37 =
  38. 38.354 + 17 =
  39. 39.451 + 17 =
  40. 40.320 + 99 =

Answer key

  1. 263
  2. 376
  3. 507
  4. 452
  5. 278
  6. 238
  7. 252
  8. 500
  9. 362
  10. 565
  11. 229
  12. 426
  13. 492
  14. 97
  15. 144
  16. 504
  17. 74
  18. 488
  19. 345
  20. 404
  21. 497
  22. 496
  23. 252
  24. 157
  25. 363
  26. 197
  27. 472
  28. 322
  29. 118
  30. 294
  31. 311
  32. 578
  33. 109
  34. 395
  35. 216
  36. 125
  37. 115
  38. 371
  39. 468
  40. 419

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