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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 612 · 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. 1.183 + 87 =
  2. 2.346 + 19 =
  3. 3.459 + 79 =
  4. 4.336 + 18 =
  5. 5.254 + 27 =
  6. 6.166 + 19 =
  7. 7.178 + 57 =
  8. 8.214 + 48 =
  9. 9.105 + 49 =
  10. 10.121 + 48 =
  11. 11.242 + 37 =
  12. 12.250 + 57 =
  13. 13.460 + 68 =
  14. 14.353 + 78 =
  15. 15.318 + 18 =
  16. 16.446 + 17 =
  17. 17.224 + 89 =
  18. 18.87 + 38 =
  19. 19.257 + 48 =
  20. 20.114 + 68 =
  21. 21.43 + 97 =
  22. 22.156 + 18 =
  23. 23.400 + 79 =
  24. 24.338 + 17 =
  25. 25.148 + 98 =
  26. 26.490 + 79 =
  27. 27.232 + 48 =
  28. 28.150 + 77 =
  29. 29.161 + 67 =
  30. 30.77 + 89 =
  31. 31.499 + 97 =
  32. 32.186 + 39 =
  33. 33.68 + 47 =
  34. 34.47 + 37 =
  35. 35.97 + 89 =
  36. 36.462 + 39 =
  37. 37.37 + 68 =
  38. 38.136 + 87 =
  39. 39.63 + 77 =
  40. 40.360 + 98 =

Answer key

  1. 270
  2. 365
  3. 538
  4. 354
  5. 281
  6. 185
  7. 235
  8. 262
  9. 154
  10. 169
  11. 279
  12. 307
  13. 528
  14. 431
  15. 336
  16. 463
  17. 313
  18. 125
  19. 305
  20. 182
  21. 140
  22. 174
  23. 479
  24. 355
  25. 246
  26. 569
  27. 280
  28. 227
  29. 228
  30. 166
  31. 596
  32. 225
  33. 115
  34. 84
  35. 186
  36. 501
  37. 105
  38. 223
  39. 140
  40. 458

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