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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 54 · 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. 1.455 + 18 =
  2. 2.116 + 78 =
  3. 3.192 + 49 =
  4. 4.109 + 49 =
  5. 5.483 + 99 =
  6. 6.29 + 49 =
  7. 7.211 + 29 =
  8. 8.239 + 48 =
  9. 9.100 + 78 =
  10. 10.197 + 97 =
  11. 11.31 + 29 =
  12. 12.26 + 27 =
  13. 13.225 + 29 =
  14. 14.160 + 89 =
  15. 15.375 + 97 =
  16. 16.181 + 29 =
  17. 17.398 + 59 =
  18. 18.138 + 89 =
  19. 19.121 + 79 =
  20. 20.82 + 77 =
  21. 21.423 + 97 =
  22. 22.424 + 59 =
  23. 23.276 + 27 =
  24. 24.225 + 89 =
  25. 25.168 + 28 =
  26. 26.355 + 59 =
  27. 27.52 + 19 =
  28. 28.422 + 58 =
  29. 29.193 + 27 =
  30. 30.182 + 27 =
  31. 31.93 + 98 =
  32. 32.162 + 99 =
  33. 33.448 + 17 =
  34. 34.28 + 48 =
  35. 35.272 + 99 =
  36. 36.231 + 38 =
  37. 37.405 + 29 =
  38. 38.86 + 97 =
  39. 39.383 + 87 =
  40. 40.36 + 99 =

Answer key

  1. 473
  2. 194
  3. 241
  4. 158
  5. 582
  6. 78
  7. 240
  8. 287
  9. 178
  10. 294
  11. 60
  12. 53
  13. 254
  14. 249
  15. 472
  16. 210
  17. 457
  18. 227
  19. 200
  20. 159
  21. 520
  22. 483
  23. 303
  24. 314
  25. 196
  26. 414
  27. 71
  28. 480
  29. 220
  30. 209
  31. 191
  32. 261
  33. 465
  34. 76
  35. 371
  36. 269
  37. 434
  38. 183
  39. 470
  40. 135

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