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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 428 · 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. 1.184 + 58 =
  2. 2.369 + 18 =
  3. 3.435 + 39 =
  4. 4.489 + 17 =
  5. 5.468 + 47 =
  6. 6.93 + 28 =
  7. 7.125 + 39 =
  8. 8.482 + 49 =
  9. 9.146 + 49 =
  10. 10.445 + 27 =
  11. 11.38 + 29 =
  12. 12.470 + 57 =
  13. 13.107 + 69 =
  14. 14.43 + 27 =
  15. 15.340 + 99 =
  16. 16.76 + 77 =
  17. 17.207 + 77 =
  18. 18.401 + 49 =
  19. 19.404 + 49 =
  20. 20.81 + 49 =
  21. 21.74 + 58 =
  22. 22.338 + 87 =
  23. 23.78 + 67 =
  24. 24.392 + 69 =
  25. 25.468 + 67 =
  26. 26.44 + 88 =
  27. 27.421 + 39 =
  28. 28.35 + 88 =
  29. 29.470 + 67 =
  30. 30.301 + 27 =
  31. 31.357 + 87 =
  32. 32.395 + 37 =
  33. 33.462 + 69 =
  34. 34.269 + 87 =
  35. 35.420 + 88 =
  36. 36.149 + 29 =
  37. 37.281 + 68 =
  38. 38.122 + 58 =
  39. 39.189 + 88 =
  40. 40.382 + 99 =

Answer key

  1. 242
  2. 387
  3. 474
  4. 506
  5. 515
  6. 121
  7. 164
  8. 531
  9. 195
  10. 472
  11. 67
  12. 527
  13. 176
  14. 70
  15. 439
  16. 153
  17. 284
  18. 450
  19. 453
  20. 130
  21. 132
  22. 425
  23. 145
  24. 461
  25. 535
  26. 132
  27. 460
  28. 123
  29. 537
  30. 328
  31. 444
  32. 432
  33. 531
  34. 356
  35. 508
  36. 178
  37. 349
  38. 180
  39. 277
  40. 481

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