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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 960 · 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. 1.33 + 89 =
  2. 2.298 + 87 =
  3. 3.258 + 17 =
  4. 4.363 + 28 =
  5. 5.327 + 98 =
  6. 6.83 + 69 =
  7. 7.371 + 19 =
  8. 8.393 + 89 =
  9. 9.101 + 18 =
  10. 10.185 + 77 =
  11. 11.169 + 17 =
  12. 12.55 + 48 =
  13. 13.224 + 27 =
  14. 14.377 + 18 =
  15. 15.126 + 19 =
  16. 16.184 + 79 =
  17. 17.489 + 38 =
  18. 18.453 + 99 =
  19. 19.149 + 48 =
  20. 20.284 + 39 =
  21. 21.312 + 87 =
  22. 22.174 + 29 =
  23. 23.280 + 99 =
  24. 24.477 + 28 =
  25. 25.427 + 89 =
  26. 26.36 + 39 =
  27. 27.109 + 79 =
  28. 28.387 + 87 =
  29. 29.50 + 17 =
  30. 30.276 + 59 =
  31. 31.158 + 89 =
  32. 32.332 + 97 =
  33. 33.296 + 77 =
  34. 34.156 + 37 =
  35. 35.469 + 19 =
  36. 36.221 + 57 =
  37. 37.147 + 27 =
  38. 38.218 + 19 =
  39. 39.153 + 77 =
  40. 40.123 + 87 =

Answer key

  1. 122
  2. 385
  3. 275
  4. 391
  5. 425
  6. 152
  7. 390
  8. 482
  9. 119
  10. 262
  11. 186
  12. 103
  13. 251
  14. 395
  15. 145
  16. 263
  17. 527
  18. 552
  19. 197
  20. 323
  21. 399
  22. 203
  23. 379
  24. 505
  25. 516
  26. 75
  27. 188
  28. 474
  29. 67
  30. 335
  31. 247
  32. 429
  33. 373
  34. 193
  35. 488
  36. 278
  37. 174
  38. 237
  39. 230
  40. 210

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