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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 369 · 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. 1.491 + 49 =
  2. 2.26 + 29 =
  3. 3.188 + 79 =
  4. 4.199 + 79 =
  5. 5.142 + 79 =
  6. 6.89 + 58 =
  7. 7.216 + 79 =
  8. 8.418 + 87 =
  9. 9.66 + 57 =
  10. 10.488 + 38 =
  11. 11.354 + 77 =
  12. 12.138 + 39 =
  13. 13.420 + 47 =
  14. 14.489 + 99 =
  15. 15.446 + 57 =
  16. 16.323 + 17 =
  17. 17.222 + 38 =
  18. 18.84 + 79 =
  19. 19.338 + 29 =
  20. 20.165 + 38 =
  21. 21.347 + 38 =
  22. 22.144 + 29 =
  23. 23.421 + 78 =
  24. 24.351 + 58 =
  25. 25.175 + 98 =
  26. 26.225 + 47 =
  27. 27.412 + 99 =
  28. 28.44 + 89 =
  29. 29.266 + 69 =
  30. 30.122 + 99 =
  31. 31.411 + 59 =
  32. 32.66 + 59 =
  33. 33.404 + 79 =
  34. 34.25 + 67 =
  35. 35.328 + 47 =
  36. 36.184 + 97 =
  37. 37.251 + 58 =
  38. 38.422 + 27 =
  39. 39.296 + 79 =
  40. 40.236 + 57 =

Answer key

  1. 540
  2. 55
  3. 267
  4. 278
  5. 221
  6. 147
  7. 295
  8. 505
  9. 123
  10. 526
  11. 431
  12. 177
  13. 467
  14. 588
  15. 503
  16. 340
  17. 260
  18. 163
  19. 367
  20. 203
  21. 385
  22. 173
  23. 499
  24. 409
  25. 273
  26. 272
  27. 511
  28. 133
  29. 335
  30. 221
  31. 470
  32. 125
  33. 483
  34. 92
  35. 375
  36. 281
  37. 309
  38. 449
  39. 375
  40. 293

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