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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 271 · 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. 1.339 + 99 =
  2. 2.222 + 69 =
  3. 3.228 + 18 =
  4. 4.84 + 99 =
  5. 5.248 + 38 =
  6. 6.310 + 17 =
  7. 7.421 + 68 =
  8. 8.110 + 28 =
  9. 9.147 + 87 =
  10. 10.308 + 58 =
  11. 11.188 + 28 =
  12. 12.55 + 97 =
  13. 13.63 + 47 =
  14. 14.398 + 38 =
  15. 15.90 + 78 =
  16. 16.33 + 99 =
  17. 17.208 + 17 =
  18. 18.234 + 49 =
  19. 19.258 + 48 =
  20. 20.84 + 88 =
  21. 21.204 + 39 =
  22. 22.450 + 47 =
  23. 23.367 + 18 =
  24. 24.81 + 87 =
  25. 25.261 + 99 =
  26. 26.456 + 17 =
  27. 27.160 + 99 =
  28. 28.231 + 58 =
  29. 29.170 + 48 =
  30. 30.491 + 88 =
  31. 31.490 + 77 =
  32. 32.495 + 48 =
  33. 33.77 + 37 =
  34. 34.272 + 87 =
  35. 35.57 + 19 =
  36. 36.344 + 27 =
  37. 37.317 + 88 =
  38. 38.351 + 57 =
  39. 39.143 + 89 =
  40. 40.372 + 39 =

Answer key

  1. 438
  2. 291
  3. 246
  4. 183
  5. 286
  6. 327
  7. 489
  8. 138
  9. 234
  10. 366
  11. 216
  12. 152
  13. 110
  14. 436
  15. 168
  16. 132
  17. 225
  18. 283
  19. 306
  20. 172
  21. 243
  22. 497
  23. 385
  24. 168
  25. 360
  26. 473
  27. 259
  28. 289
  29. 218
  30. 579
  31. 567
  32. 543
  33. 114
  34. 359
  35. 76
  36. 371
  37. 405
  38. 408
  39. 232
  40. 411

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