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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 212 · 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. 1.482 + 38 =
  2. 2.275 + 97 =
  3. 3.251 + 38 =
  4. 4.102 + 27 =
  5. 5.393 + 29 =
  6. 6.40 + 89 =
  7. 7.378 + 29 =
  8. 8.234 + 17 =
  9. 9.393 + 18 =
  10. 10.273 + 48 =
  11. 11.77 + 57 =
  12. 12.77 + 87 =
  13. 13.197 + 48 =
  14. 14.151 + 78 =
  15. 15.369 + 69 =
  16. 16.437 + 38 =
  17. 17.256 + 57 =
  18. 18.37 + 27 =
  19. 19.175 + 17 =
  20. 20.100 + 39 =
  21. 21.63 + 57 =
  22. 22.113 + 69 =
  23. 23.229 + 59 =
  24. 24.329 + 47 =
  25. 25.75 + 37 =
  26. 26.425 + 67 =
  27. 27.121 + 27 =
  28. 28.119 + 57 =
  29. 29.333 + 19 =
  30. 30.181 + 57 =
  31. 31.133 + 59 =
  32. 32.242 + 68 =
  33. 33.300 + 97 =
  34. 34.128 + 47 =
  35. 35.294 + 97 =
  36. 36.403 + 48 =
  37. 37.85 + 17 =
  38. 38.130 + 57 =
  39. 39.350 + 88 =
  40. 40.68 + 57 =

Answer key

  1. 520
  2. 372
  3. 289
  4. 129
  5. 422
  6. 129
  7. 407
  8. 251
  9. 411
  10. 321
  11. 134
  12. 164
  13. 245
  14. 229
  15. 438
  16. 475
  17. 313
  18. 64
  19. 192
  20. 139
  21. 120
  22. 182
  23. 288
  24. 376
  25. 112
  26. 492
  27. 148
  28. 176
  29. 352
  30. 238
  31. 192
  32. 310
  33. 397
  34. 175
  35. 391
  36. 451
  37. 102
  38. 187
  39. 438
  40. 125

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