There are a variety of sources in which to find usable printable math worksheets. The most common source that is often forgotten about is the library. Specifically, an education library will have access to teacher resources such as books, games, activities, and worksheets. An asset of this material is that it is listed by grade, skill level and subject topic, so it is easy to find the right
. materials. Many math workbooks are kept in the education library as well. These workbooks typically have the answer key in the back of the book, which makes it user friendly. With access to any copy machine, the teacher can copy the desired page out of the book and distribute it to students or keep for personal use. Do not write in the book as it belongs to the library, but by copying the pages allows the freedom to write on the copies and reuse them.Many websites offer teacher resources and these can vary by state. If a teacher accessed the state standards, guidelines and activities it will provide resources as well. These are usually resources that were used by teachers in that state, but the user will know that these resources are accurate and that they work.One website that offers resources specifically to math is http://edhelper.com/ratios.htm. This is a compilation of resources used by teachers all of the United States. Another website that is a little more interactive is http://www.mathworksheets4kids.com/ratio.html. This site separates the math problems by grade; therefore, the teacher can avoid the selection of math problems that is out of the children's' range of ability.If the teacher cannot find the ideal worksheet online, there is nothing wrong with creating their own worksheet. Math problems and definitions can be pulled from the school textbook to formulate their own worksheet. This will make the task original and is a usable source as well. More reference links: http://edhelper.com/ratios.htm http://www.mathworksheets4kids.com/ratio.html