John is doubling a cake recipe. The recipe calls for 1/4 cup of butter. How much butter should John use?

(1/4) * (2/1) = 2/4 = 1/2

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2/4

1/2

To figure out how much butter John should use when doubling the recipe, we need to determine how much 1/4 cup of butter doubled is.

To double 1/4 cup, we can multiply it by 2.

Mathematically, it's 1/4 * 2 = 1/2 cup.

Therefore, John should use 1/2 cup of butter when doubling the cake recipe.