How to incorporate LIVING MATH Curriculum

Do any of you use LIVING MATH http://www.livingmath.net/Home/tabid/250/language/en-US/Default.aspx , and specifically, their HISTORY PLAN lessons? If so, how do you incorporate it? Do you make it its own subject, or do you just incorporate it when it pertains to what your regular math curriculum is teaching.

I guess in general, how do you all incorporate LIVING MATH?

Thanks! (p.s. my daughter chose this smiley sunglasses face!)