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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 181 · 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. 1.164 + 29 =
  2. 2.394 + 49 =
  3. 3.448 + 57 =
  4. 4.126 + 67 =
  5. 5.307 + 17 =
  6. 6.89 + 78 =
  7. 7.129 + 28 =
  8. 8.293 + 68 =
  9. 9.193 + 17 =
  10. 10.386 + 99 =
  11. 11.173 + 27 =
  12. 12.78 + 87 =
  13. 13.464 + 39 =
  14. 14.239 + 49 =
  15. 15.138 + 37 =
  16. 16.53 + 57 =
  17. 17.110 + 49 =
  18. 18.269 + 79 =
  19. 19.291 + 57 =
  20. 20.307 + 38 =
  21. 21.406 + 57 =
  22. 22.82 + 47 =
  23. 23.267 + 67 =
  24. 24.328 + 27 =
  25. 25.473 + 98 =
  26. 26.211 + 18 =
  27. 27.316 + 29 =
  28. 28.436 + 39 =
  29. 29.374 + 19 =
  30. 30.303 + 97 =
  31. 31.62 + 59 =
  32. 32.88 + 39 =
  33. 33.57 + 87 =
  34. 34.67 + 47 =
  35. 35.250 + 19 =
  36. 36.97 + 89 =
  37. 37.183 + 68 =
  38. 38.72 + 98 =
  39. 39.446 + 89 =
  40. 40.218 + 87 =

Answer key

  1. 193
  2. 443
  3. 505
  4. 193
  5. 324
  6. 167
  7. 157
  8. 361
  9. 210
  10. 485
  11. 200
  12. 165
  13. 503
  14. 288
  15. 175
  16. 110
  17. 159
  18. 348
  19. 348
  20. 345
  21. 463
  22. 129
  23. 334
  24. 355
  25. 571
  26. 229
  27. 345
  28. 475
  29. 393
  30. 400
  31. 121
  32. 127
  33. 144
  34. 114
  35. 269
  36. 186
  37. 251
  38. 170
  39. 535
  40. 305

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