If you make your own, you can just draw three circles on a page and then 2-5 triangles on a page, and ask the child to match each circle with a triangle by drawing a line from shape to shape. Vary the shapes and the amounts. Sometimes the amounts should be equal, sometimes not.
Math worksheets are particularly useful while adding larger numbers or decimals. Practice the math problems from the workbooks and solve them. Thus, learn these five methods and solve the math efficiently.