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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 307 · 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. 1.177 + 68 =
  2. 2.93 + 68 =
  3. 3.102 + 39 =
  4. 4.479 + 39 =
  5. 5.471 + 17 =
  6. 6.172 + 18 =
  7. 7.59 + 49 =
  8. 8.49 + 67 =
  9. 9.266 + 58 =
  10. 10.160 + 49 =
  11. 11.83 + 47 =
  12. 12.87 + 69 =
  13. 13.477 + 57 =
  14. 14.118 + 59 =
  15. 15.490 + 47 =
  16. 16.203 + 67 =
  17. 17.147 + 19 =
  18. 18.57 + 67 =
  19. 19.310 + 68 =
  20. 20.455 + 38 =
  21. 21.303 + 29 =
  22. 22.347 + 89 =
  23. 23.465 + 27 =
  24. 24.27 + 97 =
  25. 25.149 + 79 =
  26. 26.212 + 68 =
  27. 27.495 + 77 =
  28. 28.170 + 59 =
  29. 29.423 + 68 =
  30. 30.454 + 97 =
  31. 31.77 + 98 =
  32. 32.448 + 48 =
  33. 33.158 + 29 =
  34. 34.177 + 87 =
  35. 35.406 + 18 =
  36. 36.57 + 57 =
  37. 37.41 + 99 =
  38. 38.482 + 17 =
  39. 39.66 + 27 =
  40. 40.428 + 97 =

Answer key

  1. 245
  2. 161
  3. 141
  4. 518
  5. 488
  6. 190
  7. 108
  8. 116
  9. 324
  10. 209
  11. 130
  12. 156
  13. 534
  14. 177
  15. 537
  16. 270
  17. 166
  18. 124
  19. 378
  20. 493
  21. 332
  22. 436
  23. 492
  24. 124
  25. 228
  26. 280
  27. 572
  28. 229
  29. 491
  30. 551
  31. 175
  32. 496
  33. 187
  34. 264
  35. 424
  36. 114
  37. 140
  38. 499
  39. 93
  40. 525

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