Shelly has a beaker that contains 5 and 2 thirds fluid ounces of water. She pours out 3 and 1 third fluid ounces of water. Which expression can be used to find the number of fluid ounces of water that remain in the beaker?

To find how much water remains, subtract the amount Shelly pours out from the amount she started with: 5 and 2 thirds minus 3 and 1 third. Choice A gives this expression. Adding the amounts or subtracting the starting amount from the amount poured out would not represent the water left.

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