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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 264 · 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. 1.292 + 57 =
  2. 2.286 + 58 =
  3. 3.162 + 29 =
  4. 4.130 + 27 =
  5. 5.419 + 78 =
  6. 6.57 + 67 =
  7. 7.234 + 87 =
  8. 8.108 + 39 =
  9. 9.143 + 87 =
  10. 10.27 + 99 =
  11. 11.89 + 79 =
  12. 12.93 + 58 =
  13. 13.233 + 77 =
  14. 14.151 + 79 =
  15. 15.427 + 57 =
  16. 16.370 + 49 =
  17. 17.284 + 99 =
  18. 18.167 + 38 =
  19. 19.312 + 67 =
  20. 20.291 + 27 =
  21. 21.77 + 67 =
  22. 22.196 + 49 =
  23. 23.414 + 47 =
  24. 24.186 + 88 =
  25. 25.463 + 77 =
  26. 26.78 + 58 =
  27. 27.80 + 29 =
  28. 28.276 + 58 =
  29. 29.495 + 29 =
  30. 30.118 + 18 =
  31. 31.77 + 77 =
  32. 32.189 + 79 =
  33. 33.66 + 18 =
  34. 34.411 + 99 =
  35. 35.210 + 17 =
  36. 36.67 + 39 =
  37. 37.310 + 68 =
  38. 38.111 + 67 =
  39. 39.195 + 79 =
  40. 40.223 + 47 =

Answer key

  1. 349
  2. 344
  3. 191
  4. 157
  5. 497
  6. 124
  7. 321
  8. 147
  9. 230
  10. 126
  11. 168
  12. 151
  13. 310
  14. 230
  15. 484
  16. 419
  17. 383
  18. 205
  19. 379
  20. 318
  21. 144
  22. 245
  23. 461
  24. 274
  25. 540
  26. 136
  27. 109
  28. 334
  29. 524
  30. 136
  31. 154
  32. 268
  33. 84
  34. 510
  35. 227
  36. 106
  37. 378
  38. 178
  39. 274
  40. 270

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