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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 596 · 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. 1.236 + 68 =
  2. 2.137 + 58 =
  3. 3.165 + 49 =
  4. 4.119 + 57 =
  5. 5.358 + 99 =
  6. 6.188 + 27 =
  7. 7.260 + 17 =
  8. 8.40 + 99 =
  9. 9.420 + 29 =
  10. 10.420 + 89 =
  11. 11.77 + 18 =
  12. 12.148 + 57 =
  13. 13.210 + 18 =
  14. 14.246 + 58 =
  15. 15.55 + 58 =
  16. 16.81 + 99 =
  17. 17.54 + 27 =
  18. 18.287 + 77 =
  19. 19.325 + 19 =
  20. 20.402 + 47 =
  21. 21.46 + 18 =
  22. 22.87 + 68 =
  23. 23.239 + 99 =
  24. 24.52 + 48 =
  25. 25.299 + 67 =
  26. 26.83 + 67 =
  27. 27.90 + 38 =
  28. 28.134 + 58 =
  29. 29.99 + 59 =
  30. 30.217 + 69 =
  31. 31.161 + 67 =
  32. 32.292 + 19 =
  33. 33.293 + 97 =
  34. 34.414 + 59 =
  35. 35.350 + 87 =
  36. 36.125 + 27 =
  37. 37.470 + 29 =
  38. 38.357 + 78 =
  39. 39.423 + 59 =
  40. 40.235 + 18 =

Answer key

  1. 304
  2. 195
  3. 214
  4. 176
  5. 457
  6. 215
  7. 277
  8. 139
  9. 449
  10. 509
  11. 95
  12. 205
  13. 228
  14. 304
  15. 113
  16. 180
  17. 81
  18. 364
  19. 344
  20. 449
  21. 64
  22. 155
  23. 338
  24. 100
  25. 366
  26. 150
  27. 128
  28. 192
  29. 158
  30. 286
  31. 228
  32. 311
  33. 390
  34. 473
  35. 437
  36. 152
  37. 499
  38. 435
  39. 482
  40. 253

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