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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 62 · 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. 1.495 + 47 =
  2. 2.142 + 39 =
  3. 3.123 + 59 =
  4. 4.179 + 48 =
  5. 5.119 + 88 =
  6. 6.294 + 78 =
  7. 7.325 + 88 =
  8. 8.230 + 28 =
  9. 9.134 + 27 =
  10. 10.276 + 59 =
  11. 11.43 + 18 =
  12. 12.321 + 59 =
  13. 13.158 + 77 =
  14. 14.265 + 79 =
  15. 15.55 + 99 =
  16. 16.217 + 78 =
  17. 17.282 + 88 =
  18. 18.366 + 57 =
  19. 19.470 + 47 =
  20. 20.195 + 37 =
  21. 21.295 + 47 =
  22. 22.253 + 38 =
  23. 23.219 + 27 =
  24. 24.96 + 19 =
  25. 25.101 + 79 =
  26. 26.440 + 39 =
  27. 27.198 + 38 =
  28. 28.195 + 79 =
  29. 29.312 + 48 =
  30. 30.97 + 59 =
  31. 31.132 + 77 =
  32. 32.345 + 78 =
  33. 33.370 + 97 =
  34. 34.455 + 27 =
  35. 35.359 + 27 =
  36. 36.190 + 29 =
  37. 37.76 + 19 =
  38. 38.249 + 77 =
  39. 39.207 + 97 =
  40. 40.106 + 27 =

Answer key

  1. 542
  2. 181
  3. 182
  4. 227
  5. 207
  6. 372
  7. 413
  8. 258
  9. 161
  10. 335
  11. 61
  12. 380
  13. 235
  14. 344
  15. 154
  16. 295
  17. 370
  18. 423
  19. 517
  20. 232
  21. 342
  22. 291
  23. 246
  24. 115
  25. 180
  26. 479
  27. 236
  28. 274
  29. 360
  30. 156
  31. 209
  32. 423
  33. 467
  34. 482
  35. 386
  36. 219
  37. 95
  38. 326
  39. 304
  40. 133

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