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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 732 · 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. 1.74 + 49 =
  2. 2.57 + 37 =
  3. 3.261 + 18 =
  4. 4.348 + 57 =
  5. 5.371 + 79 =
  6. 6.385 + 29 =
  7. 7.124 + 57 =
  8. 8.410 + 89 =
  9. 9.390 + 57 =
  10. 10.275 + 18 =
  11. 11.320 + 87 =
  12. 12.347 + 68 =
  13. 13.74 + 27 =
  14. 14.144 + 99 =
  15. 15.252 + 27 =
  16. 16.312 + 98 =
  17. 17.371 + 98 =
  18. 18.169 + 29 =
  19. 19.371 + 19 =
  20. 20.436 + 47 =
  21. 21.125 + 38 =
  22. 22.72 + 77 =
  23. 23.483 + 28 =
  24. 24.337 + 27 =
  25. 25.437 + 67 =
  26. 26.119 + 27 =
  27. 27.50 + 18 =
  28. 28.81 + 79 =
  29. 29.426 + 59 =
  30. 30.338 + 39 =
  31. 31.425 + 97 =
  32. 32.135 + 97 =
  33. 33.333 + 79 =
  34. 34.359 + 39 =
  35. 35.265 + 57 =
  36. 36.434 + 59 =
  37. 37.344 + 49 =
  38. 38.295 + 17 =
  39. 39.187 + 49 =
  40. 40.104 + 29 =

Answer key

  1. 123
  2. 94
  3. 279
  4. 405
  5. 450
  6. 414
  7. 181
  8. 499
  9. 447
  10. 293
  11. 407
  12. 415
  13. 101
  14. 243
  15. 279
  16. 410
  17. 469
  18. 198
  19. 390
  20. 483
  21. 163
  22. 149
  23. 511
  24. 364
  25. 504
  26. 146
  27. 68
  28. 160
  29. 485
  30. 377
  31. 522
  32. 232
  33. 412
  34. 398
  35. 322
  36. 493
  37. 393
  38. 312
  39. 236
  40. 133

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