How much is 30 minus 7?

To solve the problem of how much 30 minus 7 is, you start with the number 30 and subtract 7 from it. The mathematical operation can be set up as follows:

30 - 7 = 23

When performing the subtraction, you count back from 30, removing 7 units. If you visualize this on a number line, moving left from 30 by 7 units would lead you directly to 23.

This shows that the correct answer is indeed 23, as this is the result of the calculation. Understanding subtraction as a form of taking away or comparing amounts helps reinforce basic arithmetic skills.