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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 671 · 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. 1.44 + 58 =
  2. 2.77 + 99 =
  3. 3.335 + 67 =
  4. 4.143 + 17 =
  5. 5.247 + 67 =
  6. 6.218 + 19 =
  7. 7.141 + 97 =
  8. 8.295 + 38 =
  9. 9.432 + 19 =
  10. 10.110 + 47 =
  11. 11.84 + 49 =
  12. 12.128 + 27 =
  13. 13.97 + 77 =
  14. 14.158 + 58 =
  15. 15.317 + 47 =
  16. 16.41 + 27 =
  17. 17.172 + 89 =
  18. 18.115 + 28 =
  19. 19.193 + 29 =
  20. 20.166 + 39 =
  21. 21.208 + 98 =
  22. 22.423 + 69 =
  23. 23.431 + 19 =
  24. 24.244 + 68 =
  25. 25.401 + 97 =
  26. 26.321 + 99 =
  27. 27.233 + 77 =
  28. 28.258 + 97 =
  29. 29.81 + 29 =
  30. 30.128 + 88 =
  31. 31.308 + 57 =
  32. 32.148 + 27 =
  33. 33.390 + 89 =
  34. 34.265 + 97 =
  35. 35.439 + 69 =
  36. 36.360 + 19 =
  37. 37.364 + 28 =
  38. 38.344 + 29 =
  39. 39.93 + 89 =
  40. 40.263 + 37 =

Answer key

  1. 102
  2. 176
  3. 402
  4. 160
  5. 314
  6. 237
  7. 238
  8. 333
  9. 451
  10. 157
  11. 133
  12. 155
  13. 174
  14. 216
  15. 364
  16. 68
  17. 261
  18. 143
  19. 222
  20. 205
  21. 306
  22. 492
  23. 450
  24. 312
  25. 498
  26. 420
  27. 310
  28. 355
  29. 110
  30. 216
  31. 365
  32. 175
  33. 479
  34. 362
  35. 508
  36. 379
  37. 392
  38. 373
  39. 182
  40. 300

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