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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 776 · 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. 1.372 + 47 =
  2. 2.112 + 37 =
  3. 3.169 + 49 =
  4. 4.295 + 47 =
  5. 5.159 + 67 =
  6. 6.184 + 59 =
  7. 7.270 + 18 =
  8. 8.268 + 97 =
  9. 9.388 + 87 =
  10. 10.84 + 27 =
  11. 11.349 + 17 =
  12. 12.428 + 99 =
  13. 13.237 + 57 =
  14. 14.325 + 57 =
  15. 15.472 + 87 =
  16. 16.409 + 39 =
  17. 17.125 + 88 =
  18. 18.114 + 68 =
  19. 19.61 + 79 =
  20. 20.34 + 47 =
  21. 21.61 + 59 =
  22. 22.357 + 38 =
  23. 23.331 + 37 =
  24. 24.126 + 37 =
  25. 25.404 + 27 =
  26. 26.163 + 78 =
  27. 27.146 + 48 =
  28. 28.287 + 99 =
  29. 29.156 + 58 =
  30. 30.151 + 78 =
  31. 31.162 + 38 =
  32. 32.408 + 67 =
  33. 33.222 + 78 =
  34. 34.248 + 28 =
  35. 35.323 + 38 =
  36. 36.411 + 58 =
  37. 37.334 + 38 =
  38. 38.188 + 97 =
  39. 39.381 + 27 =
  40. 40.25 + 19 =

Answer key

  1. 419
  2. 149
  3. 218
  4. 342
  5. 226
  6. 243
  7. 288
  8. 365
  9. 475
  10. 111
  11. 366
  12. 527
  13. 294
  14. 382
  15. 559
  16. 448
  17. 213
  18. 182
  19. 140
  20. 81
  21. 120
  22. 395
  23. 368
  24. 163
  25. 431
  26. 241
  27. 194
  28. 386
  29. 214
  30. 229
  31. 200
  32. 475
  33. 300
  34. 276
  35. 361
  36. 469
  37. 372
  38. 285
  39. 408
  40. 44

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