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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 750 · 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. 1.258 + 18 =
  2. 2.333 + 97 =
  3. 3.72 + 17 =
  4. 4.117 + 79 =
  5. 5.28 + 58 =
  6. 6.495 + 68 =
  7. 7.121 + 29 =
  8. 8.473 + 97 =
  9. 9.338 + 18 =
  10. 10.441 + 98 =
  11. 11.264 + 28 =
  12. 12.395 + 69 =
  13. 13.263 + 17 =
  14. 14.447 + 28 =
  15. 15.79 + 87 =
  16. 16.231 + 77 =
  17. 17.165 + 97 =
  18. 18.438 + 49 =
  19. 19.412 + 29 =
  20. 20.379 + 28 =
  21. 21.493 + 77 =
  22. 22.439 + 47 =
  23. 23.71 + 39 =
  24. 24.161 + 48 =
  25. 25.63 + 37 =
  26. 26.294 + 17 =
  27. 27.278 + 79 =
  28. 28.452 + 69 =
  29. 29.243 + 39 =
  30. 30.61 + 69 =
  31. 31.465 + 37 =
  32. 32.61 + 68 =
  33. 33.249 + 87 =
  34. 34.370 + 77 =
  35. 35.323 + 18 =
  36. 36.213 + 49 =
  37. 37.166 + 27 =
  38. 38.431 + 27 =
  39. 39.424 + 58 =
  40. 40.274 + 28 =

Answer key

  1. 276
  2. 430
  3. 89
  4. 196
  5. 86
  6. 563
  7. 150
  8. 570
  9. 356
  10. 539
  11. 292
  12. 464
  13. 280
  14. 475
  15. 166
  16. 308
  17. 262
  18. 487
  19. 441
  20. 407
  21. 570
  22. 486
  23. 110
  24. 209
  25. 100
  26. 311
  27. 357
  28. 521
  29. 282
  30. 130
  31. 502
  32. 129
  33. 336
  34. 447
  35. 341
  36. 262
  37. 193
  38. 458
  39. 482
  40. 302

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