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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 9 · 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. 1.156 + 68 =
  2. 2.163 + 87 =
  3. 3.139 + 27 =
  4. 4.416 + 28 =
  5. 5.440 + 59 =
  6. 6.333 + 28 =
  7. 7.190 + 39 =
  8. 8.67 + 29 =
  9. 9.422 + 27 =
  10. 10.158 + 77 =
  11. 11.231 + 98 =
  12. 12.208 + 27 =
  13. 13.220 + 49 =
  14. 14.294 + 68 =
  15. 15.420 + 59 =
  16. 16.100 + 37 =
  17. 17.367 + 29 =
  18. 18.64 + 98 =
  19. 19.459 + 47 =
  20. 20.56 + 47 =
  21. 21.358 + 87 =
  22. 22.468 + 79 =
  23. 23.293 + 57 =
  24. 24.332 + 68 =
  25. 25.397 + 67 =
  26. 26.374 + 28 =
  27. 27.300 + 97 =
  28. 28.170 + 37 =
  29. 29.145 + 87 =
  30. 30.447 + 99 =
  31. 31.203 + 37 =
  32. 32.134 + 69 =
  33. 33.360 + 57 =
  34. 34.162 + 98 =
  35. 35.25 + 28 =
  36. 36.161 + 68 =
  37. 37.473 + 48 =
  38. 38.305 + 99 =
  39. 39.81 + 47 =
  40. 40.327 + 79 =

Answer key

  1. 224
  2. 250
  3. 166
  4. 444
  5. 499
  6. 361
  7. 229
  8. 96
  9. 449
  10. 235
  11. 329
  12. 235
  13. 269
  14. 362
  15. 479
  16. 137
  17. 396
  18. 162
  19. 506
  20. 103
  21. 445
  22. 547
  23. 350
  24. 400
  25. 464
  26. 402
  27. 397
  28. 207
  29. 232
  30. 546
  31. 240
  32. 203
  33. 417
  34. 260
  35. 53
  36. 229
  37. 521
  38. 404
  39. 128
  40. 406

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