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.
Subtract 1-, 2-, 3-, 4-, or 5-digit number from a 5-digit number
Therefore it is our job as the teacher to make sure that when we need to utilize a worksheet, we provide the students with one that is as inspiring as can be.
Or you can usually find textbooks and workbooks at the public library, where you can also copy any worksheets that you want to use.