Can you tell me more about your transition from SM to AoPS? We are using the "Primary Mathematics". Did you switch to AoPS after 5B? Would you recommend BA as side practice/ fun problems? She is doing very well with SM, doing about 3 books per year (1 level and a half). She seems to be retaining all the information. Should I slow her down and add some BA to go deeper? Or just keep going until we finish 5B and switch to AoPS? Thanks for the help.

Can you tell me more about your experience? My daughter is finishing Primary Mathematics 2B. How do you complement the two curriculums. She is doing very well with Singapore Math, but BA looks so cool. I just don't want it to be too much.