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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 10 · 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. 1.149 + 68 =
  2. 2.379 + 88 =
  3. 3.448 + 69 =
  4. 4.385 + 58 =
  5. 5.47 + 89 =
  6. 6.29 + 68 =
  7. 7.383 + 29 =
  8. 8.473 + 68 =
  9. 9.58 + 87 =
  10. 10.411 + 49 =
  11. 11.458 + 27 =
  12. 12.363 + 59 =
  13. 13.139 + 19 =
  14. 14.242 + 77 =
  15. 15.413 + 59 =
  16. 16.353 + 77 =
  17. 17.163 + 78 =
  18. 18.185 + 77 =
  19. 19.184 + 49 =
  20. 20.403 + 79 =
  21. 21.345 + 57 =
  22. 22.57 + 39 =
  23. 23.482 + 38 =
  24. 24.440 + 79 =
  25. 25.340 + 58 =
  26. 26.381 + 29 =
  27. 27.129 + 49 =
  28. 28.427 + 59 =
  29. 29.176 + 67 =
  30. 30.25 + 97 =
  31. 31.208 + 57 =
  32. 32.285 + 97 =
  33. 33.336 + 88 =
  34. 34.241 + 49 =
  35. 35.99 + 47 =
  36. 36.323 + 19 =
  37. 37.269 + 77 =
  38. 38.283 + 78 =
  39. 39.228 + 88 =
  40. 40.288 + 98 =

Answer key

  1. 217
  2. 467
  3. 517
  4. 443
  5. 136
  6. 97
  7. 412
  8. 541
  9. 145
  10. 460
  11. 485
  12. 422
  13. 158
  14. 319
  15. 472
  16. 430
  17. 241
  18. 262
  19. 233
  20. 482
  21. 402
  22. 96
  23. 520
  24. 519
  25. 398
  26. 410
  27. 178
  28. 486
  29. 243
  30. 122
  31. 265
  32. 382
  33. 424
  34. 290
  35. 146
  36. 342
  37. 346
  38. 361
  39. 316
  40. 386

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