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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 949 · 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. 1.421 + 18 =
  2. 2.276 + 47 =
  3. 3.452 + 38 =
  4. 4.166 + 99 =
  5. 5.261 + 47 =
  6. 6.267 + 37 =
  7. 7.482 + 49 =
  8. 8.149 + 57 =
  9. 9.474 + 99 =
  10. 10.376 + 17 =
  11. 11.149 + 39 =
  12. 12.435 + 29 =
  13. 13.322 + 39 =
  14. 14.425 + 78 =
  15. 15.255 + 58 =
  16. 16.312 + 57 =
  17. 17.45 + 79 =
  18. 18.321 + 97 =
  19. 19.359 + 18 =
  20. 20.154 + 17 =
  21. 21.189 + 99 =
  22. 22.119 + 87 =
  23. 23.303 + 79 =
  24. 24.144 + 79 =
  25. 25.489 + 38 =
  26. 26.417 + 48 =
  27. 27.73 + 77 =
  28. 28.34 + 19 =
  29. 29.82 + 37 =
  30. 30.321 + 57 =
  31. 31.187 + 47 =
  32. 32.300 + 18 =
  33. 33.409 + 89 =
  34. 34.182 + 89 =
  35. 35.34 + 37 =
  36. 36.205 + 18 =
  37. 37.168 + 27 =
  38. 38.382 + 38 =
  39. 39.257 + 98 =
  40. 40.359 + 27 =

Answer key

  1. 439
  2. 323
  3. 490
  4. 265
  5. 308
  6. 304
  7. 531
  8. 206
  9. 573
  10. 393
  11. 188
  12. 464
  13. 361
  14. 503
  15. 313
  16. 369
  17. 124
  18. 418
  19. 377
  20. 171
  21. 288
  22. 206
  23. 382
  24. 223
  25. 527
  26. 465
  27. 150
  28. 53
  29. 119
  30. 378
  31. 234
  32. 318
  33. 498
  34. 271
  35. 71
  36. 223
  37. 195
  38. 420
  39. 355
  40. 386

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