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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 43 · 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. 1.112 + 27 =
  2. 2.471 + 67 =
  3. 3.214 + 39 =
  4. 4.470 + 17 =
  5. 5.359 + 17 =
  6. 6.494 + 28 =
  7. 7.312 + 98 =
  8. 8.84 + 59 =
  9. 9.334 + 37 =
  10. 10.214 + 97 =
  11. 11.27 + 57 =
  12. 12.120 + 99 =
  13. 13.114 + 48 =
  14. 14.166 + 37 =
  15. 15.148 + 19 =
  16. 16.28 + 59 =
  17. 17.455 + 67 =
  18. 18.474 + 88 =
  19. 19.464 + 47 =
  20. 20.104 + 37 =
  21. 21.171 + 38 =
  22. 22.85 + 87 =
  23. 23.209 + 89 =
  24. 24.217 + 77 =
  25. 25.105 + 77 =
  26. 26.47 + 67 =
  27. 27.46 + 88 =
  28. 28.422 + 38 =
  29. 29.240 + 37 =
  30. 30.422 + 57 =
  31. 31.284 + 57 =
  32. 32.142 + 17 =
  33. 33.227 + 17 =
  34. 34.291 + 48 =
  35. 35.340 + 97 =
  36. 36.467 + 19 =
  37. 37.114 + 99 =
  38. 38.372 + 89 =
  39. 39.69 + 67 =
  40. 40.37 + 87 =

Answer key

  1. 139
  2. 538
  3. 253
  4. 487
  5. 376
  6. 522
  7. 410
  8. 143
  9. 371
  10. 311
  11. 84
  12. 219
  13. 162
  14. 203
  15. 167
  16. 87
  17. 522
  18. 562
  19. 511
  20. 141
  21. 209
  22. 172
  23. 298
  24. 294
  25. 182
  26. 114
  27. 134
  28. 460
  29. 277
  30. 479
  31. 341
  32. 159
  33. 244
  34. 339
  35. 437
  36. 486
  37. 213
  38. 461
  39. 136
  40. 124

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