Ever need to find the GCF of two numbers? Here’s a trick for finding the GCF of any two numbers — very quickly. This is an original trick, so I doubt you’ll find it anywhere else online. But most important, it’s easy to use, and it works no matter how large the numbers might be. Also nice … learning this […]

# Archive | Fractions

# The “Ladder of Primes”

Prime numbers help us reduce fractions Using the “Ladder of Primes,” students can more easily and more quickly reduce fractions to lowest terms.

# 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.

# Divisibility: Find out if 3 divides evenly into an integer

Learning the divisibility tricks speeds up mental math. How to know if 3 divides into a number evenly? This blog tells you how

# Conquering Proportions, Part 1

This trick makes it easy to solve algebraic proportions. Try it and see!

# “Fraction Sandwich” Practice Problems: Dividing a Fraction by a Fraction (without choking!)

Last week I sent out a blog that helps students divide a fraction by a fraction. The technique is called the “Fraction Sandwich.” To help students “get the hang” of this technique, here are 10 practice problems for dividing one fraction by another.

# Dividing Fractions: from annoying to FUN!

Dividing fractions has always been an annoying process, with the need to re-copy the problem and use the reciprocal of the second fraction. Well, no more. With this student-friendly new approach, kids will start dividing fractions with fun, gusto, and accuracy. Check it out!