The greatest common factor (GCF) and least common multiple (LCM) made me hate myself in high school. It’s funny, because they are REALLY easy for me now. It’s like, I got smarter with age. The good news for you is that you don’t have to wait until you are my age (a very respectable twenty-erghmph) to understand how to quickly and easily figure these things out. I’ve gone ahead and recorded a quick video to teach you how to master these.
The GCF and LCM on the SAT are essential for a great SAT score, but they are those “assumed” knowledge topics. Things like GCF, adding fractions, and unit values are essential for rocking the SAT, but they are NOT asked simply. You won’t get: What is the LCM of 20 and 35? because, frankly, you aren’t 9. Your knowledge of these two topics is assumed. And you know what happens when things are assumed, right?
So How Do We Learn This Stuff, and Why?
That awkwardly titled title is meant to lead you to this discussion. I think it’s really important to review properties of numbers, evens and odds, positives and negatives, exponents and square roots, and all the rest of these introductory math concepts because the SAT will assume you know how to do this. Before you rock some strategy, technique, or pacing mastery, you really need a solid knowledge foothold. And that’s why you are learning this and about to watch this rock-star quality video.
GCF and LCM Conclusion
These concepts aren’t hard, but they can be tricky. Hopefully I gave you a method that you can use to really do well on these topics. As you have probably noticed, I don’t actually do SAT questions in my SAT videos. That’s because I save SAT questions for my private classes. I run private in-person and online tutoring, SAT group classes, and online self-study classes. Leave a comment or send me an email with questions, comments, or screams of angst.