1/9 plus what equals 1/8?

Here we will show you how to calculate "what" in this sentence: "1/9 plus what equals 1/8?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

1/9 + x = 1/8

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 1/9 on both sides like this:

1/9 - 1/9 + x = 1/8 - 1/9

1/9 - 1/9 + x leaves x and 1/8 - 1/9 is 1/72 which means we end up with x = 1/72. Therefore, the answer to "1/9 plus what equals 1/8?" is as follows:

1/72

It is always good to double-check your math to make sure you did it right. When we entered 1/72 for x in this equation 1/9 + x = 1/8, we get the following true equation which means our math is correct.

1/9 + 1/72 = 1/8

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