Archive | Division

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: 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

“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!

Fraction divided by a fraction

Is there any way to make it easier to divide one fraction by another fraction? Read the post and you’ll see that it is possible. Here is a great math trick that makes it easier to divide fractions. Read the post and then try the division trick. You’ll be glad that you did.


November 2008 Problem of the Month: finding an alternative way to represent a number using nothing more than a few candles. Use number theory and flexible thinking to find a way to show the number. There’s a prize for the person who answers most quickly.