I dont know any site but if you are in classes between 5-8 you can choose pythagorus thorum, anglesum property, data handling bar graph etc. If you want more topics visit my site mathletes.webs.com.
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I believe that some cool projects are - Math in Chess Math in Probability Pascal's Triangle Serpinski's Triangle Math in Origami Binary Computer Coding Math in Magic Math in Music These are good topics.
All of those topics are very heavy in math. If you have a good math background and are very good at math, these topics will be easier for you to understand them.
Printable math worksheets can be found on this site http://www.kutasoftware.com/free.html. There are various topics offered and the site has worksheets as well as the answers for those worksheets.
Algebra, shape space and measure
optometrist use math 36 topics like subtracting adding mental math triangles and much more!