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Author: Sean Alexander

Sean has been a professional educator for 15 years and has taught math, physics, and astronomy at all levels.  His experience ranges from working at a high school for severe learning differences to teaching advanced physics at Stanford.  After completing his graduate work in theoretical physics Sean founded Alexander Tutoring, with the mission of revealing the deep connections between math and nature to as many students as possible. 

How to Improve Geometry Problem-Solving Skills (Without Just Memorizing Formulas)

Table of Contents Studying geometry can feel like stepping onto Mars with nothing but a protractor. Sure, there are familiar numbers and formulas, just like in algebra. But that’s where the similarities end. Geometry problem-solving involves recognizing shapes and figuring out their angles and properties. Students need to decide which formulas to use on their…

8th Grade Math Standards: What Your Child Needs to Master Before High School

Table of Contents High school looms on the horizon, and your child is itching for new subjects and more independence. Before they move on from eighth grade, though, they need to master a few critical math skills. 8th-grade math standards focus on three key areas. Students learn to solve linear equations and understand how functions…

The Most Common ACT Math Problem Mistakes—and How to Avoid Them on Test Day

Table of Contents Students in the middle of ACT prep are pretty familiar with all the tips and tricks for completing each portion. However, when it comes to the math section, many test errors come from simple mistakes that your student can avoid if they know what to look for. After spending so much time…

Triangle Congruence vs. Similarity: What’s the Difference (and Why It Matters)?

Table of Contents For middle school and high school geometry students, the difference between triangle congruence and similarity is a key concept. These are similar ideas often taught side by side. However, confusing the two leads to errors and can hamper mathematical progress. This article addresses triangle congruence versus similarity, common mistakes students make when…

Can You Retake the PSAT or SAT? What Parents Need to Know

Table of Contents Before applying to college, many middle school and high school students take standardized tests as part of the college application process. Two of the most common are the Scholastic Aptitude Test (SAT) and the Preliminary SAT (PSAT). These exams can play a significant role in college admissions, scholarships, and a student’s overall…