The following are sites that are excellent resources for educators or parents of intellectual disabled students. There are a variety of lesson plans and worksheets that deal with teaching basic money identification and counting money.
Elementary Money Skills Lesson Plans,...
Money Instructor offers interactive money games as well as lessons and coloring sheets. The site provides multiple resources that are valuable for instruction in money identification and recognizing correct values.
Teachnology website that provides worksheets for both coins and bills. It is an excellent site for counting money and comparing values.
Busyteacher site containing specific worksheets for amounts and identification of currency. The sites present a large variety of downloadable content from basic to more advanced levels.
This sites provides custom worksheets to count coins and find the missing coin. It is valuable in helping to teach currency recognition skills. There is also an option for difficulty level.