2/8 plus what equals 2/5?

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

2/8 + x = 2/5

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 2/8 on both sides like this:

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

2/8 - 2/8 + x leaves x and 2/5 - 2/8 is 3/20 which means we end up with x = 3/20. Therefore, the answer to "2/8 plus what equals 2/5?" is as follows:

3/20

It is always good to double-check your math to make sure you did it right. When we entered 3/20 for x in this equation 2/8 + x = 2/5, we get the following true equation which means our math is correct.

2/8 + 3/20 = 2/5

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