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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 104 · 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. 1.258 + 28 =
  2. 2.149 + 68 =
  3. 3.106 + 59 =
  4. 4.111 + 59 =
  5. 5.256 + 38 =
  6. 6.250 + 18 =
  7. 7.435 + 67 =
  8. 8.224 + 49 =
  9. 9.347 + 17 =
  10. 10.231 + 39 =
  11. 11.41 + 57 =
  12. 12.160 + 39 =
  13. 13.263 + 77 =
  14. 14.480 + 39 =
  15. 15.34 + 49 =
  16. 16.396 + 17 =
  17. 17.188 + 88 =
  18. 18.58 + 19 =
  19. 19.244 + 18 =
  20. 20.177 + 77 =
  21. 21.258 + 49 =
  22. 22.148 + 88 =
  23. 23.175 + 18 =
  24. 24.289 + 38 =
  25. 25.135 + 97 =
  26. 26.216 + 38 =
  27. 27.371 + 39 =
  28. 28.47 + 58 =
  29. 29.401 + 19 =
  30. 30.410 + 27 =
  31. 31.104 + 17 =
  32. 32.330 + 99 =
  33. 33.470 + 49 =
  34. 34.83 + 88 =
  35. 35.420 + 68 =
  36. 36.484 + 49 =
  37. 37.323 + 17 =
  38. 38.63 + 58 =
  39. 39.117 + 48 =
  40. 40.498 + 18 =

Answer key

  1. 286
  2. 217
  3. 165
  4. 170
  5. 294
  6. 268
  7. 502
  8. 273
  9. 364
  10. 270
  11. 98
  12. 199
  13. 340
  14. 519
  15. 83
  16. 413
  17. 276
  18. 77
  19. 262
  20. 254
  21. 307
  22. 236
  23. 193
  24. 327
  25. 232
  26. 254
  27. 410
  28. 105
  29. 420
  30. 437
  31. 121
  32. 429
  33. 519
  34. 171
  35. 488
  36. 533
  37. 340
  38. 121
  39. 165
  40. 516

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