In some US public schools, the "advanced math" curriculum puts 7th graders in algebra. In more, though, algebra isn't available until 8th grade (and that is still treated as accelerated). "Normal" math progression has standardized on algebra as the first high school course, followed by geometry, then trig, then precalculus/analysis.
The first level of math acceleration moves that high school progression up a year and has seniors taking calc 1 (limits/derivates & single variable integrals. The second level of acceleration has calc 1 in 11th grade and calc 2 (multi-variable) in 12th grade.
There are a handful of schools, mostly private, that move faster or have more diverse math curriculum offerings, but this is the most common.
The first level of math acceleration moves that high school progression up a year and has seniors taking calc 1 (limits/derivates & single variable integrals. The second level of acceleration has calc 1 in 11th grade and calc 2 (multi-variable) in 12th grade.
There are a handful of schools, mostly private, that move faster or have more diverse math curriculum offerings, but this is the most common.
So, when do American kids his algebra?
Standard curriculum: 9th grade, ~14yo