For many middle-school children, math is a real challenge. It is at this age that the concepts begin to get more abstract, and work goes beyond "concrete" ideas like adding and subtracting. It's no surprise that at this age, math can become something the student avoids, or begins to dislike.
Homeschool worksheets are a vital part of the student's homeschool experience. They allow the child to test his or her knowledge, and they offer them a practical application for their learning.
Or you can usually find textbooks and workbooks at the public library, where you can also copy any worksheets that you want to use.
Review subtraction of 2 numbers whose sums would be 18 or less