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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 518 · 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. 1.483 + 28 =
  2. 2.215 + 69 =
  3. 3.151 + 67 =
  4. 4.134 + 29 =
  5. 5.281 + 98 =
  6. 6.97 + 67 =
  7. 7.183 + 38 =
  8. 8.28 + 67 =
  9. 9.315 + 18 =
  10. 10.272 + 97 =
  11. 11.280 + 49 =
  12. 12.166 + 27 =
  13. 13.28 + 28 =
  14. 14.365 + 58 =
  15. 15.98 + 49 =
  16. 16.186 + 88 =
  17. 17.92 + 38 =
  18. 18.116 + 47 =
  19. 19.308 + 57 =
  20. 20.330 + 67 =
  21. 21.413 + 89 =
  22. 22.143 + 19 =
  23. 23.454 + 78 =
  24. 24.221 + 18 =
  25. 25.141 + 37 =
  26. 26.133 + 87 =
  27. 27.290 + 67 =
  28. 28.77 + 18 =
  29. 29.309 + 17 =
  30. 30.381 + 27 =
  31. 31.268 + 57 =
  32. 32.277 + 28 =
  33. 33.164 + 68 =
  34. 34.165 + 68 =
  35. 35.164 + 28 =
  36. 36.73 + 69 =
  37. 37.106 + 17 =
  38. 38.256 + 78 =
  39. 39.67 + 39 =
  40. 40.344 + 89 =

Answer key

  1. 511
  2. 284
  3. 218
  4. 163
  5. 379
  6. 164
  7. 221
  8. 95
  9. 333
  10. 369
  11. 329
  12. 193
  13. 56
  14. 423
  15. 147
  16. 274
  17. 130
  18. 163
  19. 365
  20. 397
  21. 502
  22. 162
  23. 532
  24. 239
  25. 178
  26. 220
  27. 357
  28. 95
  29. 326
  30. 408
  31. 325
  32. 305
  33. 232
  34. 233
  35. 192
  36. 142
  37. 123
  38. 334
  39. 106
  40. 433

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