What plus 2/5 equals 1/8?

Here we will show you how to calculate "what" in this sentence: "What plus 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 subtracting 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 -11/40 which means we end up with x = -11/40. Therefore, the answer to "What plus 2/5 equals 1/8?" is as follows:

-11/40

It is always good to double-check your math to make sure you did it right. When we entered -11/40 for x in this equation x + 2/5 = 1/8, we get the following true equation which means our math is correct.

-11/40 + 2/5 = 1/8

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