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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 935 · 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. 1.281 + 87 =
  2. 2.124 + 97 =
  3. 3.315 + 29 =
  4. 4.183 + 48 =
  5. 5.410 + 68 =
  6. 6.183 + 47 =
  7. 7.231 + 68 =
  8. 8.449 + 47 =
  9. 9.31 + 99 =
  10. 10.285 + 98 =
  11. 11.367 + 89 =
  12. 12.294 + 28 =
  13. 13.460 + 28 =
  14. 14.252 + 89 =
  15. 15.435 + 37 =
  16. 16.228 + 29 =
  17. 17.146 + 79 =
  18. 18.26 + 67 =
  19. 19.156 + 39 =
  20. 20.133 + 19 =
  21. 21.333 + 38 =
  22. 22.160 + 47 =
  23. 23.142 + 87 =
  24. 24.411 + 57 =
  25. 25.272 + 17 =
  26. 26.27 + 88 =
  27. 27.158 + 79 =
  28. 28.271 + 47 =
  29. 29.56 + 79 =
  30. 30.415 + 38 =
  31. 31.295 + 18 =
  32. 32.351 + 39 =
  33. 33.247 + 28 =
  34. 34.29 + 29 =
  35. 35.457 + 27 =
  36. 36.240 + 28 =
  37. 37.398 + 97 =
  38. 38.412 + 79 =
  39. 39.222 + 37 =
  40. 40.267 + 57 =

Answer key

  1. 368
  2. 221
  3. 344
  4. 231
  5. 478
  6. 230
  7. 299
  8. 496
  9. 130
  10. 383
  11. 456
  12. 322
  13. 488
  14. 341
  15. 472
  16. 257
  17. 225
  18. 93
  19. 195
  20. 152
  21. 371
  22. 207
  23. 229
  24. 468
  25. 289
  26. 115
  27. 237
  28. 318
  29. 135
  30. 453
  31. 313
  32. 390
  33. 275
  34. 58
  35. 484
  36. 268
  37. 495
  38. 491
  39. 259
  40. 324

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