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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 230 · 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. 1.221 + 77 =
  2. 2.156 + 79 =
  3. 3.355 + 27 =
  4. 4.224 + 69 =
  5. 5.411 + 47 =
  6. 6.53 + 79 =
  7. 7.81 + 87 =
  8. 8.73 + 19 =
  9. 9.442 + 87 =
  10. 10.301 + 57 =
  11. 11.445 + 17 =
  12. 12.118 + 59 =
  13. 13.163 + 79 =
  14. 14.328 + 59 =
  15. 15.253 + 97 =
  16. 16.258 + 39 =
  17. 17.330 + 39 =
  18. 18.52 + 78 =
  19. 19.75 + 78 =
  20. 20.36 + 59 =
  21. 21.44 + 97 =
  22. 22.280 + 37 =
  23. 23.141 + 68 =
  24. 24.340 + 18 =
  25. 25.224 + 88 =
  26. 26.408 + 38 =
  27. 27.336 + 18 =
  28. 28.49 + 77 =
  29. 29.181 + 67 =
  30. 30.413 + 17 =
  31. 31.259 + 39 =
  32. 32.379 + 77 =
  33. 33.82 + 28 =
  34. 34.381 + 28 =
  35. 35.439 + 27 =
  36. 36.82 + 68 =
  37. 37.467 + 29 =
  38. 38.426 + 69 =
  39. 39.242 + 87 =
  40. 40.494 + 29 =

Answer key

  1. 298
  2. 235
  3. 382
  4. 293
  5. 458
  6. 132
  7. 168
  8. 92
  9. 529
  10. 358
  11. 462
  12. 177
  13. 242
  14. 387
  15. 350
  16. 297
  17. 369
  18. 130
  19. 153
  20. 95
  21. 141
  22. 317
  23. 209
  24. 358
  25. 312
  26. 446
  27. 354
  28. 126
  29. 248
  30. 430
  31. 298
  32. 456
  33. 110
  34. 409
  35. 466
  36. 150
  37. 496
  38. 495
  39. 329
  40. 523

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