Homeschool Math offers online resources for a variety of math subjects including geometry, algebra, calculus, and trig among others.  Tons of free worksheets, video tutorials, and more!

Hippo Campus offers many educational high school resources and videos free of charge on many different topics ranging from algebra to physics to statistics to history and more! Check it out as a supplement to the high school courses you are teaching, and then direct your teens to those materials that you find interesting and beneficial. Please note that the material available is not necessarily written from a Christian perspective.

Summer mission trips are unique opportunities for teens to serve the Lord and to explore a variety of experiences and cultures.  If you need a starting place to explore the possibilities, Focus on the Family has compiled a listing.  (HSLDA does not endorse any of the groups listed, but merely seeks to provide you with information.)

Someone once said that mathematics is the language of science.  Good math skills are especially important to do well in high school level science courses. If your teen could use a math refresher before tackling chemistry or physics, check out this 7-week course called Bridge Math from Beginnings Publishing.

For teens interested in cyber security and forensics, Cyber Foundations is sponsoring a competition “to enable students to demonstrate mastery, win prizes, and gain recognition….” This year’s registration deadline is February 28, 2011.

For additional competitions along this same line, see the Cyber Challenge website .

Your teen may enjoy this up close and personal trachea and lung dissection. The best part is that it is free! (With discretion, you may also want them to view the pregnant sheep uterus dissection).

A helpful and free (!) outline of American Literature may be found at this government website.

Helpful writing tips and ideas for evaluating your teen’s compositions may be found on the Total Language Plus website.