What minus 2/5 equals 1/8?

Here we will show you how to calculate "what" in this sentence: "What minus 2/5 equals 1/8?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

x - 2/5 = 1/8

To solve this equation, we want x alone on the left side of the equation so we start by adding 2/5 on both sides like this:

x - 2/5 + 2/5 = 1/8 + 2/5

x - 2/5 + 2/5 leaves x and 1/8 + 2/5 is 21/40 which means we end up with x = 21/40. Therefore, the answer to "What minus 2/5 equals 1/8?" is as follows:

21/40

It is always good to double-check your math to make sure you did it right. When we entered 21/40 for x in this equation x - 2/5 = 1/8, we get the following true equation which means our math is correct.

21/40 - 2/5 = 1/8

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