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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 513 · 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. 1.85 + 98 =
  2. 2.391 + 77 =
  3. 3.171 + 39 =
  4. 4.155 + 97 =
  5. 5.310 + 88 =
  6. 6.93 + 87 =
  7. 7.388 + 99 =
  8. 8.83 + 87 =
  9. 9.341 + 99 =
  10. 10.145 + 67 =
  11. 11.315 + 49 =
  12. 12.384 + 57 =
  13. 13.215 + 99 =
  14. 14.140 + 89 =
  15. 15.280 + 49 =
  16. 16.137 + 49 =
  17. 17.332 + 29 =
  18. 18.58 + 68 =
  19. 19.190 + 18 =
  20. 20.465 + 27 =
  21. 21.424 + 47 =
  22. 22.74 + 19 =
  23. 23.235 + 87 =
  24. 24.221 + 77 =
  25. 25.203 + 47 =
  26. 26.243 + 77 =
  27. 27.390 + 38 =
  28. 28.49 + 79 =
  29. 29.437 + 77 =
  30. 30.302 + 27 =
  31. 31.297 + 39 =
  32. 32.82 + 48 =
  33. 33.370 + 37 =
  34. 34.399 + 68 =
  35. 35.489 + 39 =
  36. 36.152 + 67 =
  37. 37.83 + 88 =
  38. 38.466 + 69 =
  39. 39.59 + 78 =
  40. 40.94 + 97 =

Answer key

  1. 183
  2. 468
  3. 210
  4. 252
  5. 398
  6. 180
  7. 487
  8. 170
  9. 440
  10. 212
  11. 364
  12. 441
  13. 314
  14. 229
  15. 329
  16. 186
  17. 361
  18. 126
  19. 208
  20. 492
  21. 471
  22. 93
  23. 322
  24. 298
  25. 250
  26. 320
  27. 428
  28. 128
  29. 514
  30. 329
  31. 336
  32. 130
  33. 407
  34. 467
  35. 528
  36. 219
  37. 171
  38. 535
  39. 137
  40. 191

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