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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 733 · 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. 1.209 + 67 =
  2. 2.374 + 18 =
  3. 3.211 + 38 =
  4. 4.32 + 57 =
  5. 5.306 + 88 =
  6. 6.104 + 48 =
  7. 7.290 + 39 =
  8. 8.201 + 98 =
  9. 9.147 + 87 =
  10. 10.163 + 29 =
  11. 11.302 + 27 =
  12. 12.228 + 87 =
  13. 13.80 + 27 =
  14. 14.180 + 79 =
  15. 15.319 + 88 =
  16. 16.263 + 29 =
  17. 17.46 + 89 =
  18. 18.126 + 27 =
  19. 19.315 + 58 =
  20. 20.251 + 48 =
  21. 21.65 + 97 =
  22. 22.84 + 19 =
  23. 23.498 + 89 =
  24. 24.106 + 18 =
  25. 25.42 + 99 =
  26. 26.494 + 49 =
  27. 27.161 + 39 =
  28. 28.491 + 67 =
  29. 29.226 + 77 =
  30. 30.125 + 97 =
  31. 31.87 + 88 =
  32. 32.351 + 97 =
  33. 33.72 + 49 =
  34. 34.350 + 18 =
  35. 35.122 + 29 =
  36. 36.277 + 58 =
  37. 37.180 + 57 =
  38. 38.65 + 19 =
  39. 39.393 + 27 =
  40. 40.322 + 57 =

Answer key

  1. 276
  2. 392
  3. 249
  4. 89
  5. 394
  6. 152
  7. 329
  8. 299
  9. 234
  10. 192
  11. 329
  12. 315
  13. 107
  14. 259
  15. 407
  16. 292
  17. 135
  18. 153
  19. 373
  20. 299
  21. 162
  22. 103
  23. 587
  24. 124
  25. 141
  26. 543
  27. 200
  28. 558
  29. 303
  30. 222
  31. 175
  32. 448
  33. 121
  34. 368
  35. 151
  36. 335
  37. 237
  38. 84
  39. 420
  40. 379

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