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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 544 · 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. 1.136 + 69 =
  2. 2.160 + 37 =
  3. 3.145 + 18 =
  4. 4.171 + 47 =
  5. 5.481 + 57 =
  6. 6.249 + 18 =
  7. 7.354 + 28 =
  8. 8.377 + 27 =
  9. 9.430 + 37 =
  10. 10.375 + 58 =
  11. 11.469 + 88 =
  12. 12.102 + 57 =
  13. 13.30 + 87 =
  14. 14.342 + 68 =
  15. 15.127 + 48 =
  16. 16.432 + 19 =
  17. 17.363 + 19 =
  18. 18.221 + 17 =
  19. 19.100 + 18 =
  20. 20.346 + 99 =
  21. 21.458 + 67 =
  22. 22.482 + 69 =
  23. 23.40 + 27 =
  24. 24.421 + 39 =
  25. 25.438 + 98 =
  26. 26.42 + 37 =
  27. 27.344 + 29 =
  28. 28.346 + 67 =
  29. 29.188 + 27 =
  30. 30.167 + 39 =
  31. 31.151 + 47 =
  32. 32.56 + 58 =
  33. 33.74 + 68 =
  34. 34.141 + 18 =
  35. 35.219 + 39 =
  36. 36.274 + 18 =
  37. 37.356 + 97 =
  38. 38.153 + 27 =
  39. 39.497 + 18 =
  40. 40.432 + 89 =

Answer key

  1. 205
  2. 197
  3. 163
  4. 218
  5. 538
  6. 267
  7. 382
  8. 404
  9. 467
  10. 433
  11. 557
  12. 159
  13. 117
  14. 410
  15. 175
  16. 451
  17. 382
  18. 238
  19. 118
  20. 445
  21. 525
  22. 551
  23. 67
  24. 460
  25. 536
  26. 79
  27. 373
  28. 413
  29. 215
  30. 206
  31. 198
  32. 114
  33. 142
  34. 159
  35. 258
  36. 292
  37. 453
  38. 180
  39. 515
  40. 521

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