Gabriella’s travel shampoo bottle holds 1/2 cup of shampoo before leaving on vacation she filled the bottle to the top with 1/8 cup of shampoo how much shampoo was already in the bottle?

1/2 - 1/8 = ?

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To find out how much shampoo was already in the bottle before Gabriella filled it to the top, you can subtract the amount she added from the total capacity of the bottle.

The total capacity of the bottle is 1/2 cup.

The amount Gabriella added is 1/8 cup.

To subtract 1/8 cup from 1/2 cup, you can find a common denominator for the two fractions, which is 8.

1/2 cup is equivalent to 4/8 cup.

So, to subtract 1/8 cup from 4/8 cup, you can subtract the numerators, which gives you 4-1 = 3.

Therefore, there was already 3/8 cup of shampoo in the bottle before Gabriella filled it to the top.