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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 13 · 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. 1.432 + 89 =
  2. 2.134 + 27 =
  3. 3.205 + 98 =
  4. 4.55 + 29 =
  5. 5.186 + 97 =
  6. 6.458 + 27 =
  7. 7.157 + 47 =
  8. 8.308 + 47 =
  9. 9.103 + 97 =
  10. 10.249 + 27 =
  11. 11.147 + 69 =
  12. 12.344 + 89 =
  13. 13.99 + 47 =
  14. 14.273 + 79 =
  15. 15.168 + 67 =
  16. 16.257 + 28 =
  17. 17.103 + 99 =
  18. 18.477 + 19 =
  19. 19.245 + 29 =
  20. 20.240 + 29 =
  21. 21.105 + 19 =
  22. 22.224 + 37 =
  23. 23.316 + 57 =
  24. 24.106 + 59 =
  25. 25.337 + 57 =
  26. 26.481 + 89 =
  27. 27.161 + 27 =
  28. 28.93 + 17 =
  29. 29.74 + 37 =
  30. 30.473 + 27 =
  31. 31.157 + 37 =
  32. 32.96 + 99 =
  33. 33.226 + 99 =
  34. 34.262 + 89 =
  35. 35.247 + 27 =
  36. 36.387 + 38 =
  37. 37.61 + 37 =
  38. 38.66 + 57 =
  39. 39.209 + 88 =
  40. 40.274 + 57 =

Answer key

  1. 521
  2. 161
  3. 303
  4. 84
  5. 283
  6. 485
  7. 204
  8. 355
  9. 200
  10. 276
  11. 216
  12. 433
  13. 146
  14. 352
  15. 235
  16. 285
  17. 202
  18. 496
  19. 274
  20. 269
  21. 124
  22. 261
  23. 373
  24. 165
  25. 394
  26. 570
  27. 188
  28. 110
  29. 111
  30. 500
  31. 194
  32. 195
  33. 325
  34. 351
  35. 274
  36. 425
  37. 98
  38. 123
  39. 297
  40. 331

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