It's interesting to use an ethnic achievement gap as a legal basis for opposing a particular math program. That most United States school districts don't simply use Singapore Math<p><a href="http://www.singaporemath.com/Primary_Math_s/21.htm" rel="nofollow">http://www.singaporemath.com/Primary_Math_s/21.htm</a><p>shows that most math curriculum adoptions are not made on the basis of best results for least expense.