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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 39 · 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. 1.164 + 48 =
  2. 2.442 + 77 =
  3. 3.435 + 87 =
  4. 4.444 + 29 =
  5. 5.324 + 37 =
  6. 6.358 + 68 =
  7. 7.70 + 97 =
  8. 8.118 + 57 =
  9. 9.470 + 19 =
  10. 10.355 + 19 =
  11. 11.210 + 89 =
  12. 12.345 + 39 =
  13. 13.41 + 89 =
  14. 14.45 + 57 =
  15. 15.124 + 38 =
  16. 16.327 + 37 =
  17. 17.300 + 18 =
  18. 18.436 + 37 =
  19. 19.312 + 67 =
  20. 20.435 + 28 =
  21. 21.369 + 19 =
  22. 22.122 + 18 =
  23. 23.203 + 28 =
  24. 24.354 + 57 =
  25. 25.132 + 38 =
  26. 26.68 + 49 =
  27. 27.119 + 77 =
  28. 28.416 + 49 =
  29. 29.456 + 29 =
  30. 30.310 + 89 =
  31. 31.478 + 87 =
  32. 32.205 + 78 =
  33. 33.302 + 88 =
  34. 34.378 + 98 =
  35. 35.281 + 39 =
  36. 36.458 + 79 =
  37. 37.363 + 79 =
  38. 38.474 + 77 =
  39. 39.464 + 39 =
  40. 40.260 + 38 =

Answer key

  1. 212
  2. 519
  3. 522
  4. 473
  5. 361
  6. 426
  7. 167
  8. 175
  9. 489
  10. 374
  11. 299
  12. 384
  13. 130
  14. 102
  15. 162
  16. 364
  17. 318
  18. 473
  19. 379
  20. 463
  21. 388
  22. 140
  23. 231
  24. 411
  25. 170
  26. 117
  27. 196
  28. 465
  29. 485
  30. 399
  31. 565
  32. 283
  33. 390
  34. 476
  35. 320
  36. 537
  37. 442
  38. 551
  39. 503
  40. 298

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