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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 604 · 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. 1.195 + 37 =
  2. 2.121 + 19 =
  3. 3.26 + 58 =
  4. 4.41 + 28 =
  5. 5.235 + 47 =
  6. 6.456 + 28 =
  7. 7.181 + 88 =
  8. 8.64 + 79 =
  9. 9.37 + 17 =
  10. 10.450 + 79 =
  11. 11.368 + 77 =
  12. 12.106 + 17 =
  13. 13.219 + 58 =
  14. 14.438 + 19 =
  15. 15.106 + 19 =
  16. 16.227 + 97 =
  17. 17.468 + 77 =
  18. 18.79 + 49 =
  19. 19.250 + 49 =
  20. 20.487 + 39 =
  21. 21.337 + 98 =
  22. 22.392 + 27 =
  23. 23.356 + 38 =
  24. 24.416 + 27 =
  25. 25.431 + 17 =
  26. 26.175 + 18 =
  27. 27.357 + 67 =
  28. 28.385 + 88 =
  29. 29.28 + 97 =
  30. 30.65 + 48 =
  31. 31.166 + 18 =
  32. 32.155 + 68 =
  33. 33.63 + 99 =
  34. 34.150 + 37 =
  35. 35.144 + 18 =
  36. 36.462 + 47 =
  37. 37.421 + 29 =
  38. 38.484 + 29 =
  39. 39.417 + 67 =
  40. 40.258 + 18 =

Answer key

  1. 232
  2. 140
  3. 84
  4. 69
  5. 282
  6. 484
  7. 269
  8. 143
  9. 54
  10. 529
  11. 445
  12. 123
  13. 277
  14. 457
  15. 125
  16. 324
  17. 545
  18. 128
  19. 299
  20. 526
  21. 435
  22. 419
  23. 394
  24. 443
  25. 448
  26. 193
  27. 424
  28. 473
  29. 125
  30. 113
  31. 184
  32. 223
  33. 162
  34. 187
  35. 162
  36. 509
  37. 450
  38. 513
  39. 484
  40. 276

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