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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 670 · 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. 1.137 + 48 =
  2. 2.223 + 68 =
  3. 3.403 + 78 =
  4. 4.209 + 87 =
  5. 5.341 + 78 =
  6. 6.400 + 19 =
  7. 7.416 + 77 =
  8. 8.174 + 48 =
  9. 9.322 + 59 =
  10. 10.306 + 48 =
  11. 11.338 + 88 =
  12. 12.477 + 69 =
  13. 13.188 + 59 =
  14. 14.348 + 17 =
  15. 15.132 + 58 =
  16. 16.100 + 68 =
  17. 17.257 + 89 =
  18. 18.374 + 27 =
  19. 19.233 + 77 =
  20. 20.30 + 29 =
  21. 21.493 + 47 =
  22. 22.297 + 57 =
  23. 23.366 + 17 =
  24. 24.498 + 39 =
  25. 25.238 + 39 =
  26. 26.314 + 99 =
  27. 27.213 + 87 =
  28. 28.259 + 58 =
  29. 29.452 + 87 =
  30. 30.92 + 27 =
  31. 31.131 + 18 =
  32. 32.42 + 87 =
  33. 33.330 + 67 =
  34. 34.465 + 39 =
  35. 35.493 + 17 =
  36. 36.163 + 89 =
  37. 37.300 + 97 =
  38. 38.228 + 17 =
  39. 39.199 + 69 =
  40. 40.153 + 39 =

Answer key

  1. 185
  2. 291
  3. 481
  4. 296
  5. 419
  6. 419
  7. 493
  8. 222
  9. 381
  10. 354
  11. 426
  12. 546
  13. 247
  14. 365
  15. 190
  16. 168
  17. 346
  18. 401
  19. 310
  20. 59
  21. 540
  22. 354
  23. 383
  24. 537
  25. 277
  26. 413
  27. 300
  28. 317
  29. 539
  30. 119
  31. 149
  32. 129
  33. 397
  34. 504
  35. 510
  36. 252
  37. 397
  38. 245
  39. 268
  40. 192

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