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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 293 · 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. 1.298 + 87 =
  2. 2.93 + 19 =
  3. 3.484 + 17 =
  4. 4.37 + 27 =
  5. 5.202 + 68 =
  6. 6.393 + 97 =
  7. 7.81 + 57 =
  8. 8.46 + 78 =
  9. 9.241 + 49 =
  10. 10.157 + 17 =
  11. 11.103 + 68 =
  12. 12.482 + 97 =
  13. 13.310 + 27 =
  14. 14.96 + 79 =
  15. 15.445 + 38 =
  16. 16.294 + 97 =
  17. 17.374 + 17 =
  18. 18.78 + 59 =
  19. 19.121 + 87 =
  20. 20.159 + 18 =
  21. 21.123 + 37 =
  22. 22.122 + 49 =
  23. 23.122 + 58 =
  24. 24.138 + 57 =
  25. 25.267 + 67 =
  26. 26.485 + 69 =
  27. 27.124 + 37 =
  28. 28.449 + 98 =
  29. 29.59 + 89 =
  30. 30.279 + 77 =
  31. 31.64 + 18 =
  32. 32.262 + 97 =
  33. 33.377 + 27 =
  34. 34.456 + 67 =
  35. 35.35 + 29 =
  36. 36.405 + 37 =
  37. 37.375 + 97 =
  38. 38.261 + 18 =
  39. 39.322 + 28 =
  40. 40.302 + 38 =

Answer key

  1. 385
  2. 112
  3. 501
  4. 64
  5. 270
  6. 490
  7. 138
  8. 124
  9. 290
  10. 174
  11. 171
  12. 579
  13. 337
  14. 175
  15. 483
  16. 391
  17. 391
  18. 137
  19. 208
  20. 177
  21. 160
  22. 171
  23. 180
  24. 195
  25. 334
  26. 554
  27. 161
  28. 547
  29. 148
  30. 356
  31. 82
  32. 359
  33. 404
  34. 523
  35. 64
  36. 442
  37. 472
  38. 279
  39. 350
  40. 340

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