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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 953 · 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. 1.177 + 37 =
  2. 2.254 + 19 =
  3. 3.128 + 78 =
  4. 4.88 + 29 =
  5. 5.110 + 87 =
  6. 6.44 + 18 =
  7. 7.100 + 49 =
  8. 8.310 + 19 =
  9. 9.434 + 19 =
  10. 10.187 + 49 =
  11. 11.212 + 58 =
  12. 12.244 + 77 =
  13. 13.479 + 67 =
  14. 14.334 + 57 =
  15. 15.163 + 29 =
  16. 16.288 + 98 =
  17. 17.218 + 19 =
  18. 18.319 + 27 =
  19. 19.96 + 27 =
  20. 20.383 + 79 =
  21. 21.269 + 27 =
  22. 22.107 + 48 =
  23. 23.106 + 87 =
  24. 24.445 + 37 =
  25. 25.189 + 48 =
  26. 26.78 + 89 =
  27. 27.488 + 67 =
  28. 28.388 + 98 =
  29. 29.187 + 77 =
  30. 30.318 + 37 =
  31. 31.425 + 48 =
  32. 32.345 + 49 =
  33. 33.185 + 28 =
  34. 34.390 + 78 =
  35. 35.362 + 79 =
  36. 36.111 + 49 =
  37. 37.101 + 97 =
  38. 38.47 + 18 =
  39. 39.65 + 78 =
  40. 40.230 + 17 =

Answer key

  1. 214
  2. 273
  3. 206
  4. 117
  5. 197
  6. 62
  7. 149
  8. 329
  9. 453
  10. 236
  11. 270
  12. 321
  13. 546
  14. 391
  15. 192
  16. 386
  17. 237
  18. 346
  19. 123
  20. 462
  21. 296
  22. 155
  23. 193
  24. 482
  25. 237
  26. 167
  27. 555
  28. 486
  29. 264
  30. 355
  31. 473
  32. 394
  33. 213
  34. 468
  35. 441
  36. 160
  37. 198
  38. 65
  39. 143
  40. 247

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