What is the result of 30-21?

To find the result of 30 minus 21, you can set up the subtraction as follows:

30 - 21

Breaking it down step-by-step:

• You start with 30, which is the larger number.

• You subtract 21 from it.

When you perform the subtraction:

30 - 21 = 9

This means that when you take away 21 from 30, you are left with 9. The calculation shows you are essentially counting down from 30 by 21 units, confirming that the difference is indeed 9.

This reasoning is grounded in the basic principles of arithmetic, specifically the operation of subtraction, where you're determining how much remains after removing a certain quantity from a total. Thus, the correct answer is 9.