Gifted Issues Discussion homepage Forums General Discussion Supplementing Common Core Math with Traditional

Tigerle,

They do have Americanized/adapted SM materials. They even have a CC edition:

http://www.singaporemath.com/Primary_Mathematics_CC_Ed_s/252.htm
http://www.singaporemath.com/v/sf_pmcct3a.pdf

Looking at the sample pages, I have no issues with them.

ETA: I'd guess that the reason as to why these books aren't used more frequently in the classroom has a lot to do with the marketing (and perhaps lobbying) power of the big US publishing company.