My 7th grader just showed me his Crap / Connected Mathematics Project CMP 1 book which simply expects them to know that the area of a circle is p r squared to get the volume (you multiply by height). But the 6th grade book treats the method as the answer to a derivation exploration that isn't in the book. It only appears in the teacher book as "one possible answer", and in the letter to the parents. In fact, EVERY standard and formula method if you look it up in the index looks like "based on what you have learned, can you devise an algorithm or method to compute adding fractions / adding decimals / area of a circle / etc. The term "common denominator" does not appear anywhere in fractions, not even the index. It shows up in ADDING DECIMAL NUMBERS (??). There is a formula for area of a trapezoid on the cover of that book - that is the ONLY formula they actually give you in the entire student book. My understanding is that CMP 1 did not even expect students to learn standard methods at all. All of this information is on a 4 page "math review" card you can buy at Kinkos.
** NONE OF THE METHODS LISTED ON THE MATH REVIEW CARD ARE ANYWHERE IN CMP 2 STUDENT TEXTBOOK. **