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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 58 · 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. 1.499 + 79 =
  2. 2.381 + 59 =
  3. 3.112 + 28 =
  4. 4.242 + 29 =
  5. 5.381 + 18 =
  6. 6.350 + 77 =
  7. 7.497 + 59 =
  8. 8.361 + 78 =
  9. 9.355 + 18 =
  10. 10.243 + 97 =
  11. 11.289 + 39 =
  12. 12.48 + 98 =
  13. 13.227 + 18 =
  14. 14.122 + 37 =
  15. 15.348 + 58 =
  16. 16.87 + 27 =
  17. 17.41 + 17 =
  18. 18.237 + 47 =
  19. 19.37 + 67 =
  20. 20.34 + 77 =
  21. 21.309 + 17 =
  22. 22.295 + 27 =
  23. 23.39 + 29 =
  24. 24.160 + 29 =
  25. 25.70 + 77 =
  26. 26.386 + 29 =
  27. 27.56 + 88 =
  28. 28.427 + 19 =
  29. 29.463 + 99 =
  30. 30.280 + 77 =
  31. 31.269 + 69 =
  32. 32.374 + 59 =
  33. 33.120 + 57 =
  34. 34.468 + 69 =
  35. 35.410 + 77 =
  36. 36.163 + 97 =
  37. 37.327 + 19 =
  38. 38.106 + 79 =
  39. 39.313 + 98 =
  40. 40.377 + 87 =

Answer key

  1. 578
  2. 440
  3. 140
  4. 271
  5. 399
  6. 427
  7. 556
  8. 439
  9. 373
  10. 340
  11. 328
  12. 146
  13. 245
  14. 159
  15. 406
  16. 114
  17. 58
  18. 284
  19. 104
  20. 111
  21. 326
  22. 322
  23. 68
  24. 189
  25. 147
  26. 415
  27. 144
  28. 446
  29. 562
  30. 357
  31. 338
  32. 433
  33. 177
  34. 537
  35. 487
  36. 260
  37. 346
  38. 185
  39. 411
  40. 464

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