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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 297 · 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. 1.252 + 87 =
  2. 2.469 + 68 =
  3. 3.379 + 47 =
  4. 4.492 + 99 =
  5. 5.110 + 38 =
  6. 6.42 + 59 =
  7. 7.306 + 19 =
  8. 8.372 + 29 =
  9. 9.117 + 59 =
  10. 10.283 + 77 =
  11. 11.251 + 69 =
  12. 12.285 + 78 =
  13. 13.96 + 38 =
  14. 14.416 + 87 =
  15. 15.77 + 68 =
  16. 16.72 + 19 =
  17. 17.164 + 78 =
  18. 18.324 + 37 =
  19. 19.105 + 69 =
  20. 20.162 + 47 =
  21. 21.364 + 39 =
  22. 22.383 + 89 =
  23. 23.40 + 27 =
  24. 24.457 + 58 =
  25. 25.264 + 49 =
  26. 26.416 + 29 =
  27. 27.467 + 39 =
  28. 28.469 + 17 =
  29. 29.149 + 27 =
  30. 30.74 + 27 =
  31. 31.133 + 39 =
  32. 32.116 + 87 =
  33. 33.241 + 77 =
  34. 34.55 + 47 =
  35. 35.498 + 99 =
  36. 36.370 + 98 =
  37. 37.29 + 47 =
  38. 38.83 + 57 =
  39. 39.36 + 29 =
  40. 40.124 + 59 =

Answer key

  1. 339
  2. 537
  3. 426
  4. 591
  5. 148
  6. 101
  7. 325
  8. 401
  9. 176
  10. 360
  11. 320
  12. 363
  13. 134
  14. 503
  15. 145
  16. 91
  17. 242
  18. 361
  19. 174
  20. 209
  21. 403
  22. 472
  23. 67
  24. 515
  25. 313
  26. 445
  27. 506
  28. 486
  29. 176
  30. 101
  31. 172
  32. 203
  33. 318
  34. 102
  35. 597
  36. 468
  37. 76
  38. 140
  39. 65
  40. 183

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