This is how to calculate "4 plus what equals 13?" In other words, 4 plus a number equals 13. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

**4 + what = 13**

To solve this equation, we first add -4 to each side of the equal sign like this:

**4 - 4 + what = 13 - 4**

Then, we do the calculation to get the answer to "4 plus what equals 13?" as follows:

**What = 9**

The answer to "4 plus what equals 13?" is 9. You know this answer is correct because 4 plus 9 equals 13.

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**4 plus what equals 14?**

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