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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 458 · 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. 1.29 + 57 =
  2. 2.146 + 77 =
  3. 3.425 + 79 =
  4. 4.357 + 69 =
  5. 5.28 + 47 =
  6. 6.234 + 99 =
  7. 7.135 + 79 =
  8. 8.90 + 99 =
  9. 9.55 + 47 =
  10. 10.172 + 17 =
  11. 11.166 + 89 =
  12. 12.470 + 98 =
  13. 13.127 + 29 =
  14. 14.144 + 29 =
  15. 15.107 + 87 =
  16. 16.81 + 79 =
  17. 17.354 + 39 =
  18. 18.307 + 17 =
  19. 19.50 + 18 =
  20. 20.419 + 38 =
  21. 21.36 + 28 =
  22. 22.425 + 97 =
  23. 23.243 + 68 =
  24. 24.329 + 87 =
  25. 25.301 + 18 =
  26. 26.464 + 99 =
  27. 27.366 + 77 =
  28. 28.397 + 38 =
  29. 29.431 + 17 =
  30. 30.351 + 48 =
  31. 31.458 + 58 =
  32. 32.81 + 48 =
  33. 33.64 + 27 =
  34. 34.109 + 68 =
  35. 35.77 + 59 =
  36. 36.397 + 99 =
  37. 37.156 + 89 =
  38. 38.268 + 18 =
  39. 39.397 + 18 =
  40. 40.235 + 69 =

Answer key

  1. 86
  2. 223
  3. 504
  4. 426
  5. 75
  6. 333
  7. 214
  8. 189
  9. 102
  10. 189
  11. 255
  12. 568
  13. 156
  14. 173
  15. 194
  16. 160
  17. 393
  18. 324
  19. 68
  20. 457
  21. 64
  22. 522
  23. 311
  24. 416
  25. 319
  26. 563
  27. 443
  28. 435
  29. 448
  30. 399
  31. 516
  32. 129
  33. 91
  34. 177
  35. 136
  36. 496
  37. 245
  38. 286
  39. 415
  40. 304

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