San Francisco decided to move Algebra I from eighth grade (about 13 years old) to ninth grade for all pupils, hoping that an extra year of maths would leave pupils better prepared.
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I was educated using story problems.
Their ‘maths logic’ does not compute.
When I grew up, if you were in the advanced classes, you took Algebra I in 8th grade; everyone else took it in 9th grade.
I took it in 8th grade — tied for first with another (8th grade) student at the county Algebra contest, beating out a bunch of 9th graders.