If you do want to produce your own worksheets and don't have the Microsoft software, you can download free tools like OpenOffice or use an online word processor or spreadsheet such as the free Google Docs which help you do similar tasks. You just need to create a table with as many rows and columns as you need and then type in some numbers before printing it off for your children to practice _ depending on the level of complexity choose single digits or multiple digits. If you're not sure what level to start at, aim low, start with easy numbers and see how your child goes, the self_esteem boost they'll get from acing the first worksheet will give them confidence for more difficult math problems.
Graphing Linear Equations. If you have several sets of x and y coordinates, you can now draw lines on a graph. Free math worksheets can drill you on plotting x and y coordinates while graphing linear equation. A linear equation when drawn on a line graph always yields a straight line. Take "y = 2x + 1" for example _ a linear equation. Assign any three numbers to x, and then solve for y. Whatever numbers you assign to x and whatever y comes out to be, you will end up with a straight line. Remember to practice on easier math worksheets first before moving on to writing a linear equation or to the systems of linear equations. Good luck!