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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 730 · 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. 1.319 + 77 =
  2. 2.126 + 57 =
  3. 3.425 + 48 =
  4. 4.39 + 47 =
  5. 5.294 + 58 =
  6. 6.92 + 68 =
  7. 7.114 + 38 =
  8. 8.190 + 78 =
  9. 9.62 + 99 =
  10. 10.60 + 59 =
  11. 11.36 + 37 =
  12. 12.308 + 87 =
  13. 13.315 + 98 =
  14. 14.414 + 68 =
  15. 15.325 + 17 =
  16. 16.183 + 97 =
  17. 17.94 + 97 =
  18. 18.380 + 69 =
  19. 19.179 + 79 =
  20. 20.407 + 99 =
  21. 21.319 + 99 =
  22. 22.375 + 98 =
  23. 23.230 + 29 =
  24. 24.157 + 77 =
  25. 25.462 + 79 =
  26. 26.448 + 47 =
  27. 27.287 + 88 =
  28. 28.119 + 39 =
  29. 29.196 + 39 =
  30. 30.213 + 38 =
  31. 31.41 + 18 =
  32. 32.412 + 49 =
  33. 33.230 + 29 =
  34. 34.31 + 77 =
  35. 35.236 + 48 =
  36. 36.126 + 89 =
  37. 37.341 + 89 =
  38. 38.271 + 68 =
  39. 39.99 + 28 =
  40. 40.439 + 48 =

Answer key

  1. 396
  2. 183
  3. 473
  4. 86
  5. 352
  6. 160
  7. 152
  8. 268
  9. 161
  10. 119
  11. 73
  12. 395
  13. 413
  14. 482
  15. 342
  16. 280
  17. 191
  18. 449
  19. 258
  20. 506
  21. 418
  22. 473
  23. 259
  24. 234
  25. 541
  26. 495
  27. 375
  28. 158
  29. 235
  30. 251
  31. 59
  32. 461
  33. 259
  34. 108
  35. 284
  36. 215
  37. 430
  38. 339
  39. 127
  40. 487

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