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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 666 · 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. 1.379 + 78 =
  2. 2.377 + 99 =
  3. 3.406 + 87 =
  4. 4.192 + 17 =
  5. 5.342 + 77 =
  6. 6.147 + 89 =
  7. 7.34 + 68 =
  8. 8.418 + 48 =
  9. 9.80 + 37 =
  10. 10.244 + 78 =
  11. 11.41 + 97 =
  12. 12.395 + 28 =
  13. 13.124 + 29 =
  14. 14.490 + 79 =
  15. 15.230 + 78 =
  16. 16.204 + 69 =
  17. 17.320 + 57 =
  18. 18.448 + 59 =
  19. 19.163 + 37 =
  20. 20.279 + 39 =
  21. 21.424 + 29 =
  22. 22.487 + 87 =
  23. 23.332 + 39 =
  24. 24.429 + 69 =
  25. 25.219 + 68 =
  26. 26.46 + 39 =
  27. 27.235 + 68 =
  28. 28.27 + 79 =
  29. 29.105 + 78 =
  30. 30.100 + 58 =
  31. 31.376 + 57 =
  32. 32.397 + 18 =
  33. 33.137 + 47 =
  34. 34.118 + 18 =
  35. 35.457 + 38 =
  36. 36.320 + 89 =
  37. 37.481 + 37 =
  38. 38.361 + 58 =
  39. 39.156 + 88 =
  40. 40.147 + 28 =

Answer key

  1. 457
  2. 476
  3. 493
  4. 209
  5. 419
  6. 236
  7. 102
  8. 466
  9. 117
  10. 322
  11. 138
  12. 423
  13. 153
  14. 569
  15. 308
  16. 273
  17. 377
  18. 507
  19. 200
  20. 318
  21. 453
  22. 574
  23. 371
  24. 498
  25. 287
  26. 85
  27. 303
  28. 106
  29. 183
  30. 158
  31. 433
  32. 415
  33. 184
  34. 136
  35. 495
  36. 409
  37. 518
  38. 419
  39. 244
  40. 175

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