Sydney read 3/12 of her reading assignment yesterday and 5/12 of her reading assignment today. What fraction of her reading assignment has she completed?

Responses
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D

None of the above.

The fraction of Sydney's reading assignment that she has completed can be found by adding the fractions she read yesterday and today.

3/12 + 5/12 = 8/12

Therefore, Sydney has completed 8/12, or 2/3 of her reading assignment.