March 17th, 2011
This is a quick heads-up in case you didn’t already know. Math Mammoth is currently 40% off at Homeschool Buyer’s Co-Op and is headed to 50% off if there are 40 or so more buyers. This sale is only until the end of the month though! We are buying the Blue series because we use it to supplement our Math U See with it.
Hope this is helpful to you! We like the author’s emphasis on mental math and appreciate how she uses various approaches for the same topic.