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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 77 · 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. 1.492 + 89 =
  2. 2.358 + 87 =
  3. 3.46 + 68 =
  4. 4.104 + 69 =
  5. 5.238 + 68 =
  6. 6.283 + 28 =
  7. 7.457 + 67 =
  8. 8.465 + 97 =
  9. 9.153 + 58 =
  10. 10.469 + 27 =
  11. 11.154 + 58 =
  12. 12.302 + 48 =
  13. 13.351 + 19 =
  14. 14.262 + 58 =
  15. 15.197 + 28 =
  16. 16.196 + 67 =
  17. 17.273 + 68 =
  18. 18.479 + 18 =
  19. 19.223 + 68 =
  20. 20.446 + 19 =
  21. 21.128 + 67 =
  22. 22.238 + 37 =
  23. 23.418 + 48 =
  24. 24.409 + 48 =
  25. 25.105 + 58 =
  26. 26.426 + 97 =
  27. 27.204 + 37 =
  28. 28.65 + 67 =
  29. 29.157 + 47 =
  30. 30.474 + 87 =
  31. 31.319 + 79 =
  32. 32.138 + 27 =
  33. 33.354 + 27 =
  34. 34.428 + 17 =
  35. 35.340 + 97 =
  36. 36.52 + 38 =
  37. 37.420 + 79 =
  38. 38.28 + 79 =
  39. 39.93 + 37 =
  40. 40.93 + 29 =

Answer key

  1. 581
  2. 445
  3. 114
  4. 173
  5. 306
  6. 311
  7. 524
  8. 562
  9. 211
  10. 496
  11. 212
  12. 350
  13. 370
  14. 320
  15. 225
  16. 263
  17. 341
  18. 497
  19. 291
  20. 465
  21. 195
  22. 275
  23. 466
  24. 457
  25. 163
  26. 523
  27. 241
  28. 132
  29. 204
  30. 561
  31. 398
  32. 165
  33. 381
  34. 445
  35. 437
  36. 90
  37. 499
  38. 107
  39. 130
  40. 122

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