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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 82 · 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. 1.417 + 37 =
  2. 2.267 + 39 =
  3. 3.272 + 89 =
  4. 4.109 + 27 =
  5. 5.137 + 29 =
  6. 6.228 + 89 =
  7. 7.314 + 38 =
  8. 8.112 + 67 =
  9. 9.165 + 77 =
  10. 10.130 + 57 =
  11. 11.173 + 99 =
  12. 12.330 + 68 =
  13. 13.414 + 37 =
  14. 14.55 + 87 =
  15. 15.110 + 89 =
  16. 16.195 + 38 =
  17. 17.300 + 77 =
  18. 18.397 + 69 =
  19. 19.290 + 48 =
  20. 20.270 + 77 =
  21. 21.58 + 37 =
  22. 22.211 + 69 =
  23. 23.264 + 48 =
  24. 24.279 + 47 =
  25. 25.72 + 99 =
  26. 26.98 + 69 =
  27. 27.425 + 18 =
  28. 28.314 + 29 =
  29. 29.160 + 49 =
  30. 30.275 + 38 =
  31. 31.153 + 77 =
  32. 32.73 + 39 =
  33. 33.390 + 67 =
  34. 34.45 + 18 =
  35. 35.185 + 97 =
  36. 36.335 + 88 =
  37. 37.437 + 98 =
  38. 38.152 + 98 =
  39. 39.68 + 47 =
  40. 40.285 + 38 =

Answer key

  1. 454
  2. 306
  3. 361
  4. 136
  5. 166
  6. 317
  7. 352
  8. 179
  9. 242
  10. 187
  11. 272
  12. 398
  13. 451
  14. 142
  15. 199
  16. 233
  17. 377
  18. 466
  19. 338
  20. 347
  21. 95
  22. 280
  23. 312
  24. 326
  25. 171
  26. 167
  27. 443
  28. 343
  29. 209
  30. 313
  31. 230
  32. 112
  33. 457
  34. 63
  35. 282
  36. 423
  37. 535
  38. 250
  39. 115
  40. 323

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