4/7 plus what equals 8/9?

Here we will show you how to calculate "what" in this sentence: "4/7 plus what equals 8/9?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

4/7 + x = 8/9

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 4/7 on both sides like this:

4/7 - 4/7 + x = 8/9 - 4/7

4/7 - 4/7 + x leaves x and 8/9 - 4/7 is 20/63 which means we end up with x = 20/63. Therefore, the answer to "4/7 plus what equals 8/9?" is as follows:

20/63

It is always good to double-check your math to make sure you did it right. When we entered 20/63 for x in this equation 4/7 + x = 8/9, we get the following true equation which means our math is correct.

4/7 + 20/63 = 8/9

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