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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 801 · 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. 1.350 + 37 =
  2. 2.279 + 57 =
  3. 3.179 + 57 =
  4. 4.94 + 37 =
  5. 5.437 + 77 =
  6. 6.99 + 79 =
  7. 7.114 + 48 =
  8. 8.405 + 77 =
  9. 9.60 + 57 =
  10. 10.83 + 19 =
  11. 11.379 + 59 =
  12. 12.253 + 97 =
  13. 13.288 + 67 =
  14. 14.186 + 67 =
  15. 15.283 + 28 =
  16. 16.73 + 19 =
  17. 17.208 + 89 =
  18. 18.395 + 47 =
  19. 19.80 + 37 =
  20. 20.381 + 87 =
  21. 21.310 + 89 =
  22. 22.88 + 58 =
  23. 23.234 + 79 =
  24. 24.376 + 47 =
  25. 25.473 + 47 =
  26. 26.63 + 47 =
  27. 27.103 + 29 =
  28. 28.234 + 18 =
  29. 29.39 + 37 =
  30. 30.273 + 19 =
  31. 31.119 + 88 =
  32. 32.119 + 39 =
  33. 33.333 + 37 =
  34. 34.225 + 69 =
  35. 35.287 + 48 =
  36. 36.43 + 79 =
  37. 37.446 + 38 =
  38. 38.265 + 27 =
  39. 39.118 + 97 =
  40. 40.66 + 69 =

Answer key

  1. 387
  2. 336
  3. 236
  4. 131
  5. 514
  6. 178
  7. 162
  8. 482
  9. 117
  10. 102
  11. 438
  12. 350
  13. 355
  14. 253
  15. 311
  16. 92
  17. 297
  18. 442
  19. 117
  20. 468
  21. 399
  22. 146
  23. 313
  24. 423
  25. 520
  26. 110
  27. 132
  28. 252
  29. 76
  30. 292
  31. 207
  32. 158
  33. 370
  34. 294
  35. 335
  36. 122
  37. 484
  38. 292
  39. 215
  40. 135

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