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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 552 · 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. 1.110 + 19 =
  2. 2.123 + 57 =
  3. 3.54 + 68 =
  4. 4.210 + 79 =
  5. 5.191 + 17 =
  6. 6.68 + 28 =
  7. 7.227 + 87 =
  8. 8.244 + 17 =
  9. 9.330 + 68 =
  10. 10.401 + 58 =
  11. 11.379 + 18 =
  12. 12.239 + 57 =
  13. 13.414 + 77 =
  14. 14.283 + 37 =
  15. 15.315 + 37 =
  16. 16.126 + 67 =
  17. 17.190 + 48 =
  18. 18.426 + 59 =
  19. 19.313 + 87 =
  20. 20.65 + 67 =
  21. 21.332 + 28 =
  22. 22.285 + 29 =
  23. 23.386 + 57 =
  24. 24.104 + 57 =
  25. 25.464 + 69 =
  26. 26.439 + 27 =
  27. 27.387 + 37 =
  28. 28.101 + 28 =
  29. 29.273 + 29 =
  30. 30.497 + 89 =
  31. 31.41 + 57 =
  32. 32.87 + 59 =
  33. 33.140 + 79 =
  34. 34.414 + 87 =
  35. 35.238 + 59 =
  36. 36.271 + 19 =
  37. 37.307 + 57 =
  38. 38.252 + 49 =
  39. 39.296 + 49 =
  40. 40.253 + 19 =

Answer key

  1. 129
  2. 180
  3. 122
  4. 289
  5. 208
  6. 96
  7. 314
  8. 261
  9. 398
  10. 459
  11. 397
  12. 296
  13. 491
  14. 320
  15. 352
  16. 193
  17. 238
  18. 485
  19. 400
  20. 132
  21. 360
  22. 314
  23. 443
  24. 161
  25. 533
  26. 466
  27. 424
  28. 129
  29. 302
  30. 586
  31. 98
  32. 146
  33. 219
  34. 501
  35. 297
  36. 290
  37. 364
  38. 301
  39. 345
  40. 272

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