Perhaps at your upcoming parent / teacher conference you could request your child be given the placement test for Singapore Math? http://www.singaporemath.com/Placement_s/12.htm

Also, similar to Kai's recommendation, familiarize yourself with what Singapore Math has on offer in terms of "Supplementary Math", maybe your teacher is not aware of what is possible? http://www.singaporemath.com/Supplementary_Math_s/43.htm