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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 634 · 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. 1.349 + 49 =
  2. 2.464 + 29 =
  3. 3.256 + 67 =
  4. 4.358 + 77 =
  5. 5.375 + 79 =
  6. 6.336 + 77 =
  7. 7.299 + 29 =
  8. 8.182 + 87 =
  9. 9.371 + 48 =
  10. 10.43 + 97 =
  11. 11.151 + 49 =
  12. 12.433 + 59 =
  13. 13.60 + 17 =
  14. 14.216 + 18 =
  15. 15.320 + 27 =
  16. 16.267 + 69 =
  17. 17.42 + 78 =
  18. 18.224 + 68 =
  19. 19.280 + 87 =
  20. 20.300 + 18 =
  21. 21.341 + 67 =
  22. 22.392 + 78 =
  23. 23.370 + 78 =
  24. 24.240 + 68 =
  25. 25.27 + 17 =
  26. 26.426 + 69 =
  27. 27.45 + 38 =
  28. 28.393 + 77 =
  29. 29.167 + 18 =
  30. 30.350 + 97 =
  31. 31.431 + 67 =
  32. 32.472 + 98 =
  33. 33.170 + 97 =
  34. 34.95 + 48 =
  35. 35.221 + 58 =
  36. 36.484 + 49 =
  37. 37.275 + 78 =
  38. 38.258 + 19 =
  39. 39.147 + 28 =
  40. 40.431 + 97 =

Answer key

  1. 398
  2. 493
  3. 323
  4. 435
  5. 454
  6. 413
  7. 328
  8. 269
  9. 419
  10. 140
  11. 200
  12. 492
  13. 77
  14. 234
  15. 347
  16. 336
  17. 120
  18. 292
  19. 367
  20. 318
  21. 408
  22. 470
  23. 448
  24. 308
  25. 44
  26. 495
  27. 83
  28. 470
  29. 185
  30. 447
  31. 498
  32. 570
  33. 267
  34. 143
  35. 279
  36. 533
  37. 353
  38. 277
  39. 175
  40. 528

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