Problems should use the Courier font. Why? Every Courier font character uses the same amount of space. A comma is the same width as the number 5. This means that all of the numbers line up perfectly for carrying during addition and bringing the zero down in division.
Division worksheets are not all created equal. There are basically two types: math fact sheets and long division sheets. Math fact sheets are easy to create (with the division symbol between the numbers) and require few if any paper calculation from students. Long division sheets are more difficult to program, e.g., with or