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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 998 · 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. 1.49 + 48 =
  2. 2.118 + 69 =
  3. 3.177 + 87 =
  4. 4.226 + 27 =
  5. 5.398 + 27 =
  6. 6.28 + 49 =
  7. 7.60 + 87 =
  8. 8.89 + 37 =
  9. 9.401 + 77 =
  10. 10.433 + 39 =
  11. 11.30 + 49 =
  12. 12.208 + 77 =
  13. 13.300 + 97 =
  14. 14.190 + 39 =
  15. 15.306 + 38 =
  16. 16.375 + 38 =
  17. 17.499 + 57 =
  18. 18.152 + 28 =
  19. 19.290 + 19 =
  20. 20.102 + 69 =
  21. 21.216 + 79 =
  22. 22.378 + 18 =
  23. 23.69 + 88 =
  24. 24.134 + 78 =
  25. 25.286 + 48 =
  26. 26.365 + 18 =
  27. 27.181 + 27 =
  28. 28.274 + 87 =
  29. 29.407 + 38 =
  30. 30.276 + 77 =
  31. 31.57 + 38 =
  32. 32.214 + 37 =
  33. 33.399 + 17 =
  34. 34.155 + 69 =
  35. 35.77 + 68 =
  36. 36.312 + 18 =
  37. 37.461 + 97 =
  38. 38.294 + 99 =
  39. 39.194 + 68 =
  40. 40.286 + 88 =

Answer key

  1. 97
  2. 187
  3. 264
  4. 253
  5. 425
  6. 77
  7. 147
  8. 126
  9. 478
  10. 472
  11. 79
  12. 285
  13. 397
  14. 229
  15. 344
  16. 413
  17. 556
  18. 180
  19. 309
  20. 171
  21. 295
  22. 396
  23. 157
  24. 212
  25. 334
  26. 383
  27. 208
  28. 361
  29. 445
  30. 353
  31. 95
  32. 251
  33. 416
  34. 224
  35. 145
  36. 330
  37. 558
  38. 393
  39. 262
  40. 374

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