It has finally happened … students have taken the new PSAT. I know because Singing Turtle Tutoring (the tutoring company that my wife and I run) prepares students for this test, and over the last two weeks I’ve been helping many get ready for the new PSAT’s math section. My big word of advice for many students: learn […]

# Archive | Math Tricks

# Journey to the LCM … and Beyond!

In this blog/video I want to take you a little bit deeper into the world of … the LCM! Yes, that fascinating little mathematical entity is beckoning us to explore it further. Several readers wrote to me after I posted my LCM “trick,” saying they want to see me demonstrate WHY this “shortcut” works. One […]

# How to tell if a Number is Divisible by 8

How to tell if 8 divides into a number. There is a simple test for this. This post explains this.

# How to See Why the Divisibility Trick for 3 Works

There’s a nifty trick for finding out if 3 divides evenly into a number. This little proof shows why the trick works.

# (Divisibility) Practice Makes Perfect

Practice problems for reducing fractions. Use divisibility tricks to reduce fractions.

# Divisibility by 7: Is there really a trick?

There’s a weird and interesting trick for divisibility by 7. This blog tells you how to do it. Sit back and be amazed.

# Divisibility by 4 — Principles & Trick

It is not hard to find out if 4 goes into a number evenly. Here is a trick that shows you how to find out very quickly.

# Multiplication Trick — Multiplying by 5

Quick easy trick for multiplying even numbers by 5.

# Times Tables, Learning the Threes

Learning times tables can seem like drudgery. But here’s a fun, rhythmic game approach to learning the threes. Try it and see if you don’t have success.

# Multiplication Trick: x 25

How to quickly multiply by 25. This is a fun math trick that anyone can learn in 5 minutes or less.