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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 324 · 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. 1.204 + 17 =
  2. 2.71 + 17 =
  3. 3.263 + 59 =
  4. 4.134 + 38 =
  5. 5.321 + 79 =
  6. 6.198 + 59 =
  7. 7.226 + 29 =
  8. 8.450 + 29 =
  9. 9.111 + 57 =
  10. 10.437 + 17 =
  11. 11.348 + 28 =
  12. 12.280 + 17 =
  13. 13.270 + 89 =
  14. 14.444 + 89 =
  15. 15.278 + 38 =
  16. 16.291 + 58 =
  17. 17.283 + 88 =
  18. 18.295 + 38 =
  19. 19.309 + 18 =
  20. 20.498 + 49 =
  21. 21.97 + 68 =
  22. 22.292 + 57 =
  23. 23.367 + 97 =
  24. 24.81 + 78 =
  25. 25.99 + 77 =
  26. 26.97 + 37 =
  27. 27.254 + 87 =
  28. 28.293 + 18 =
  29. 29.424 + 39 =
  30. 30.303 + 99 =
  31. 31.128 + 29 =
  32. 32.42 + 98 =
  33. 33.456 + 78 =
  34. 34.157 + 68 =
  35. 35.249 + 18 =
  36. 36.124 + 28 =
  37. 37.35 + 78 =
  38. 38.412 + 88 =
  39. 39.295 + 97 =
  40. 40.93 + 89 =

Answer key

  1. 221
  2. 88
  3. 322
  4. 172
  5. 400
  6. 257
  7. 255
  8. 479
  9. 168
  10. 454
  11. 376
  12. 297
  13. 359
  14. 533
  15. 316
  16. 349
  17. 371
  18. 333
  19. 327
  20. 547
  21. 165
  22. 349
  23. 464
  24. 159
  25. 176
  26. 134
  27. 341
  28. 311
  29. 463
  30. 402
  31. 157
  32. 140
  33. 534
  34. 225
  35. 267
  36. 152
  37. 113
  38. 500
  39. 392
  40. 182

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