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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 402 · 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. 1.189 + 48 =
  2. 2.34 + 27 =
  3. 3.84 + 87 =
  4. 4.100 + 79 =
  5. 5.478 + 39 =
  6. 6.416 + 29 =
  7. 7.298 + 29 =
  8. 8.362 + 78 =
  9. 9.38 + 78 =
  10. 10.426 + 57 =
  11. 11.97 + 47 =
  12. 12.343 + 38 =
  13. 13.355 + 67 =
  14. 14.162 + 37 =
  15. 15.396 + 88 =
  16. 16.322 + 87 =
  17. 17.391 + 77 =
  18. 18.330 + 18 =
  19. 19.60 + 97 =
  20. 20.364 + 19 =
  21. 21.143 + 37 =
  22. 22.455 + 77 =
  23. 23.398 + 87 =
  24. 24.85 + 89 =
  25. 25.451 + 17 =
  26. 26.207 + 38 =
  27. 27.356 + 49 =
  28. 28.487 + 58 =
  29. 29.234 + 29 =
  30. 30.463 + 58 =
  31. 31.218 + 97 =
  32. 32.390 + 37 =
  33. 33.382 + 18 =
  34. 34.472 + 19 =
  35. 35.123 + 58 =
  36. 36.94 + 98 =
  37. 37.253 + 27 =
  38. 38.281 + 59 =
  39. 39.56 + 89 =
  40. 40.310 + 99 =

Answer key

  1. 237
  2. 61
  3. 171
  4. 179
  5. 517
  6. 445
  7. 327
  8. 440
  9. 116
  10. 483
  11. 144
  12. 381
  13. 422
  14. 199
  15. 484
  16. 409
  17. 468
  18. 348
  19. 157
  20. 383
  21. 180
  22. 532
  23. 485
  24. 174
  25. 468
  26. 245
  27. 405
  28. 545
  29. 263
  30. 521
  31. 315
  32. 427
  33. 400
  34. 491
  35. 181
  36. 192
  37. 280
  38. 340
  39. 145
  40. 409

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