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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 119 · 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 + 97 =
  2. 2.386 + 18 =
  3. 3.27 + 69 =
  4. 4.200 + 57 =
  5. 5.365 + 88 =
  6. 6.166 + 29 =
  7. 7.58 + 48 =
  8. 8.430 + 27 =
  9. 9.129 + 77 =
  10. 10.405 + 78 =
  11. 11.312 + 27 =
  12. 12.89 + 18 =
  13. 13.459 + 77 =
  14. 14.108 + 37 =
  15. 15.358 + 37 =
  16. 16.200 + 57 =
  17. 17.93 + 49 =
  18. 18.42 + 68 =
  19. 19.209 + 89 =
  20. 20.217 + 99 =
  21. 21.72 + 28 =
  22. 22.383 + 58 =
  23. 23.350 + 27 =
  24. 24.301 + 78 =
  25. 25.338 + 97 =
  26. 26.221 + 88 =
  27. 27.246 + 47 =
  28. 28.302 + 79 =
  29. 29.88 + 58 =
  30. 30.146 + 69 =
  31. 31.32 + 57 =
  32. 32.257 + 19 =
  33. 33.165 + 47 =
  34. 34.229 + 57 =
  35. 35.65 + 38 =
  36. 36.63 + 58 =
  37. 37.46 + 39 =
  38. 38.286 + 59 =
  39. 39.480 + 48 =
  40. 40.312 + 58 =

Answer key

  1. 471
  2. 404
  3. 96
  4. 257
  5. 453
  6. 195
  7. 106
  8. 457
  9. 206
  10. 483
  11. 339
  12. 107
  13. 536
  14. 145
  15. 395
  16. 257
  17. 142
  18. 110
  19. 298
  20. 316
  21. 100
  22. 441
  23. 377
  24. 379
  25. 435
  26. 309
  27. 293
  28. 381
  29. 146
  30. 215
  31. 89
  32. 276
  33. 212
  34. 286
  35. 103
  36. 121
  37. 85
  38. 345
  39. 528
  40. 370

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