Our school district here in the northwest suburbs of Chicago has done the same. The exception is the Magnet program which my daughters in. Almost all those 6th graders take algebra. Mine is in fifth grade and takes pre-algebra. There are also neighborhood kids probably 10% in sixth grade taking pre algebra. This is actually a step up for the district. One of the junior highs(seventh and eight grade)actually teaches the advanced algebra you take before Calculus. I thought this was crazy but my daughter knows a sixth grade boy in her homeroom class that had algebra last year and has Geometry this year. They bus him to the junior high. Also the high school course offerings correspond with what the K-8 school district is doing,
I'd advise you to e-mail administration with great praise concerning what you've written, it's unusual and admirable. Also beware in a couple of years of the backlash from the HS on just what a couple of us have discussed, HS math teachers trying to make a case to get rid of such acceleration using statements unsupported by data or studies.
We were blessed, the whole school district that both our DSs went / go to school in is on one campus, 4 elementary schools, 1 intermediate school (5-6) 1 MS (7-9) and 1 HS with a Community College right across the street....which all simplifies subject / grade acceleration as well as students at the HS taking college classes when they've topped out on a subject.
