One thing I noticed in the US is that there seems to be many wasted years in mathematics education. Between learning long division (maybe 4th grade ?) and alge

One thing I noticed in the US is that there seems to be many wasted years in mathematics education. Between learning long division (maybe 4th grade ?) and algebra which I didn't get until the first year in high school (9th grade) I don't think I really learned or was taught anything of significance. EDIT: My recollection is poor, long division and the associated concepts like fractions and decimals may have been later and spread out over more years, but I'm sure there were at least 2 to 3 wasted years in my mathematics education.