4/9 plus what equals 1/9?

Here we will show you how to calculate "what" in this sentence: "4/9 plus what equals 1/9?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

4/9 + x = 1/9

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 4/9 on both sides like this:

4/9 - 4/9 + x = 1/9 - 4/9

4/9 - 4/9 + x leaves x and 1/9 - 4/9 is -1/3 which means we end up with x = -1/3. Therefore, the answer to "4/9 plus what equals 1/9?" is as follows:

-1/3

It is always good to double-check your math to make sure you did it right. When we entered -1/3 for x in this equation 4/9 + x = 1/9, we get the following true equation which means our math is correct.

4/9 + -1/3 = 1/9

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