Question

Sarah is making a dessert that calls for 4/5 cup of crushed cookies. If she has already crushed 7/10 cup, how much more does she need?

Answer 1

We can represent 4/5 as 4/5 × 2/2 = 8/10

Since she has already crushed 7/10 cups she only needs to crush (8-7)/10 cups = 1/10 cups

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Answer 2

Total he need = 4/5 cup of crushed cookies

she already have = 7/10 cup of cookies .

so , she need more = 4/5 - 7/10 = (4*2-7)/10 = (8-7)/10 = 1/10 cup of cookies ...

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