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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 740 · 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. 1.128 + 98 =
  2. 2.358 + 77 =
  3. 3.357 + 47 =
  4. 4.241 + 77 =
  5. 5.184 + 27 =
  6. 6.452 + 48 =
  7. 7.49 + 87 =
  8. 8.248 + 47 =
  9. 9.365 + 68 =
  10. 10.439 + 28 =
  11. 11.256 + 79 =
  12. 12.363 + 78 =
  13. 13.156 + 58 =
  14. 14.387 + 69 =
  15. 15.184 + 47 =
  16. 16.212 + 49 =
  17. 17.449 + 27 =
  18. 18.166 + 18 =
  19. 19.241 + 29 =
  20. 20.41 + 28 =
  21. 21.335 + 27 =
  22. 22.406 + 19 =
  23. 23.306 + 58 =
  24. 24.154 + 97 =
  25. 25.222 + 19 =
  26. 26.97 + 68 =
  27. 27.40 + 98 =
  28. 28.429 + 97 =
  29. 29.141 + 77 =
  30. 30.388 + 79 =
  31. 31.155 + 27 =
  32. 32.295 + 27 =
  33. 33.347 + 19 =
  34. 34.321 + 69 =
  35. 35.234 + 37 =
  36. 36.123 + 48 =
  37. 37.234 + 38 =
  38. 38.379 + 28 =
  39. 39.282 + 78 =
  40. 40.432 + 37 =

Answer key

  1. 226
  2. 435
  3. 404
  4. 318
  5. 211
  6. 500
  7. 136
  8. 295
  9. 433
  10. 467
  11. 335
  12. 441
  13. 214
  14. 456
  15. 231
  16. 261
  17. 476
  18. 184
  19. 270
  20. 69
  21. 362
  22. 425
  23. 364
  24. 251
  25. 241
  26. 165
  27. 138
  28. 526
  29. 218
  30. 467
  31. 182
  32. 322
  33. 366
  34. 390
  35. 271
  36. 171
  37. 272
  38. 407
  39. 360
  40. 469

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