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<p>That’s just process stupidity.</p>
<p>If someone fails algebra, figure out why they failed, fix the problem and then proceed.</p>
<p>Son tutored university math for many years - the biggest problem he ran into were students making algebra errors. The students didn’t have problems understanding calculus. Students could have trig or log issues too.</p>
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<p>Vast majority - being smart enough isn’t the problem. Having math presented well and reinforced at the pace that the student can absorb it is.</p>