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

# Archive | Division

# 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

# Abbreviating the Order of Operations

The PEMDAS abbreviation for the order of operations misleads students into thinking they should always multiply before dividing, and always add before subtracting.

# “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 PROBLEM OF THE MONTH

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.