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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 80 · 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. 1.135 + 87 =
  2. 2.322 + 87 =
  3. 3.345 + 17 =
  4. 4.400 + 18 =
  5. 5.82 + 19 =
  6. 6.167 + 19 =
  7. 7.358 + 89 =
  8. 8.241 + 27 =
  9. 9.31 + 98 =
  10. 10.248 + 28 =
  11. 11.413 + 79 =
  12. 12.454 + 69 =
  13. 13.230 + 37 =
  14. 14.371 + 38 =
  15. 15.43 + 77 =
  16. 16.353 + 67 =
  17. 17.281 + 38 =
  18. 18.309 + 59 =
  19. 19.312 + 39 =
  20. 20.478 + 87 =
  21. 21.365 + 87 =
  22. 22.218 + 97 =
  23. 23.387 + 39 =
  24. 24.441 + 98 =
  25. 25.30 + 89 =
  26. 26.281 + 59 =
  27. 27.333 + 37 =
  28. 28.272 + 39 =
  29. 29.273 + 28 =
  30. 30.265 + 89 =
  31. 31.386 + 57 =
  32. 32.222 + 58 =
  33. 33.26 + 49 =
  34. 34.233 + 98 =
  35. 35.408 + 88 =
  36. 36.391 + 27 =
  37. 37.456 + 99 =
  38. 38.63 + 37 =
  39. 39.95 + 78 =
  40. 40.105 + 27 =

Answer key

  1. 222
  2. 409
  3. 362
  4. 418
  5. 101
  6. 186
  7. 447
  8. 268
  9. 129
  10. 276
  11. 492
  12. 523
  13. 267
  14. 409
  15. 120
  16. 420
  17. 319
  18. 368
  19. 351
  20. 565
  21. 452
  22. 315
  23. 426
  24. 539
  25. 119
  26. 340
  27. 370
  28. 311
  29. 301
  30. 354
  31. 443
  32. 280
  33. 75
  34. 331
  35. 496
  36. 418
  37. 555
  38. 100
  39. 173
  40. 132

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