DODEA 4G 4.NF.3 Skill Check Adding Fractions

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A pair of fraction models is given.
Which explanation is a correct reasoning for the sum of the shaded parts?

Each model shows 7/8 shaded, so the sum is 27/8

Each model shows 7/8 shaded, so the sum is 2 7/8 .

Each model is divided into 8 parts. There are 14 total parts shaded so the sum is 14/8 .

Each model is divided into 8 parts. There are 14 total parts shaded so the sum is 1 4/8 .

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