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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 186 · 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. 1.350 + 87 =
  2. 2.308 + 49 =
  3. 3.36 + 29 =
  4. 4.215 + 28 =
  5. 5.340 + 98 =
  6. 6.48 + 69 =
  7. 7.347 + 88 =
  8. 8.319 + 29 =
  9. 9.74 + 28 =
  10. 10.128 + 69 =
  11. 11.256 + 77 =
  12. 12.480 + 69 =
  13. 13.360 + 97 =
  14. 14.92 + 27 =
  15. 15.182 + 98 =
  16. 16.263 + 29 =
  17. 17.272 + 27 =
  18. 18.413 + 37 =
  19. 19.436 + 29 =
  20. 20.148 + 47 =
  21. 21.292 + 27 =
  22. 22.281 + 87 =
  23. 23.457 + 37 =
  24. 24.366 + 29 =
  25. 25.363 + 29 =
  26. 26.310 + 87 =
  27. 27.380 + 89 =
  28. 28.437 + 49 =
  29. 29.168 + 68 =
  30. 30.65 + 29 =
  31. 31.168 + 27 =
  32. 32.114 + 29 =
  33. 33.268 + 49 =
  34. 34.68 + 29 =
  35. 35.474 + 48 =
  36. 36.147 + 58 =
  37. 37.95 + 27 =
  38. 38.393 + 47 =
  39. 39.151 + 97 =
  40. 40.126 + 38 =

Answer key

  1. 437
  2. 357
  3. 65
  4. 243
  5. 438
  6. 117
  7. 435
  8. 348
  9. 102
  10. 197
  11. 333
  12. 549
  13. 457
  14. 119
  15. 280
  16. 292
  17. 299
  18. 450
  19. 465
  20. 195
  21. 319
  22. 368
  23. 494
  24. 395
  25. 392
  26. 397
  27. 469
  28. 486
  29. 236
  30. 94
  31. 195
  32. 143
  33. 317
  34. 97
  35. 522
  36. 205
  37. 122
  38. 440
  39. 248
  40. 164

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