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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 516 · 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. 1.485 + 97 =
  2. 2.430 + 68 =
  3. 3.289 + 88 =
  4. 4.84 + 57 =
  5. 5.191 + 67 =
  6. 6.225 + 97 =
  7. 7.52 + 89 =
  8. 8.371 + 87 =
  9. 9.375 + 39 =
  10. 10.148 + 48 =
  11. 11.408 + 49 =
  12. 12.449 + 78 =
  13. 13.36 + 18 =
  14. 14.50 + 77 =
  15. 15.131 + 87 =
  16. 16.56 + 38 =
  17. 17.318 + 87 =
  18. 18.90 + 59 =
  19. 19.74 + 28 =
  20. 20.53 + 78 =
  21. 21.393 + 59 =
  22. 22.132 + 38 =
  23. 23.96 + 47 =
  24. 24.167 + 89 =
  25. 25.459 + 77 =
  26. 26.44 + 17 =
  27. 27.29 + 17 =
  28. 28.26 + 69 =
  29. 29.181 + 58 =
  30. 30.63 + 87 =
  31. 31.120 + 49 =
  32. 32.325 + 97 =
  33. 33.105 + 87 =
  34. 34.321 + 28 =
  35. 35.468 + 19 =
  36. 36.274 + 79 =
  37. 37.37 + 17 =
  38. 38.125 + 57 =
  39. 39.235 + 29 =
  40. 40.118 + 47 =

Answer key

  1. 582
  2. 498
  3. 377
  4. 141
  5. 258
  6. 322
  7. 141
  8. 458
  9. 414
  10. 196
  11. 457
  12. 527
  13. 54
  14. 127
  15. 218
  16. 94
  17. 405
  18. 149
  19. 102
  20. 131
  21. 452
  22. 170
  23. 143
  24. 256
  25. 536
  26. 61
  27. 46
  28. 95
  29. 239
  30. 150
  31. 169
  32. 422
  33. 192
  34. 349
  35. 487
  36. 353
  37. 54
  38. 182
  39. 264
  40. 165

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