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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 323 · 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. 1.134 + 69 =
  2. 2.405 + 78 =
  3. 3.390 + 19 =
  4. 4.248 + 88 =
  5. 5.357 + 37 =
  6. 6.385 + 18 =
  7. 7.106 + 58 =
  8. 8.177 + 87 =
  9. 9.345 + 38 =
  10. 10.474 + 79 =
  11. 11.134 + 28 =
  12. 12.66 + 87 =
  13. 13.65 + 87 =
  14. 14.83 + 38 =
  15. 15.109 + 57 =
  16. 16.251 + 69 =
  17. 17.138 + 69 =
  18. 18.303 + 97 =
  19. 19.46 + 57 =
  20. 20.46 + 89 =
  21. 21.163 + 58 =
  22. 22.152 + 27 =
  23. 23.340 + 67 =
  24. 24.475 + 79 =
  25. 25.65 + 18 =
  26. 26.35 + 69 =
  27. 27.54 + 39 =
  28. 28.153 + 87 =
  29. 29.279 + 89 =
  30. 30.142 + 57 =
  31. 31.325 + 47 =
  32. 32.411 + 87 =
  33. 33.380 + 98 =
  34. 34.438 + 67 =
  35. 35.68 + 27 =
  36. 36.175 + 78 =
  37. 37.291 + 69 =
  38. 38.112 + 68 =
  39. 39.399 + 78 =
  40. 40.274 + 77 =

Answer key

  1. 203
  2. 483
  3. 409
  4. 336
  5. 394
  6. 403
  7. 164
  8. 264
  9. 383
  10. 553
  11. 162
  12. 153
  13. 152
  14. 121
  15. 166
  16. 320
  17. 207
  18. 400
  19. 103
  20. 135
  21. 221
  22. 179
  23. 407
  24. 554
  25. 83
  26. 104
  27. 93
  28. 240
  29. 368
  30. 199
  31. 372
  32. 498
  33. 478
  34. 505
  35. 95
  36. 253
  37. 360
  38. 180
  39. 477
  40. 351

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