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Types of Numbers
Multiplication By Clever Form Of 1: At a Glance

Introduction to Multiplication By Clever Form Of 1:

This super handy trick lets you simplify an expression without changing its value. Which is good, because fractions should not be subject to inflation.

Sample Problem

Here's a horrible fraction. A really horrible fraction. This thing is getting coal for Christmas.

If we multiply it by 1, we won't change its value. If we multiply it by anything equivalent to 1 (such as ) we also won't change its value. Since each of our two mini-fractions has a 3 in its denominator, what happens if we multiply the whole thing by ?

Our new numerator is , and our new denominator is . Now the fraction's value hasn't changed, it looks much more manageable, and it might even get an Xbox under the tree this year.

We can also use this trick to rewrite decimal division problems...

3.4/7.8 10/10  = 34/78 

...or when we have a division problem written as a fraction.

Multiplication By Clever Form Of 1 Practice:

Example 1

1.52/3.1 x (10/10) =


Exercise 1

Find the cleverly disguised form of 1 that will let you simplify the rotten fractions below, then simplify. And quickly, please - it hurts our eyes just to look at them. 


Exercise 2

Find the cleverly disguised form of 1 that will let you simplify the rotten fractions below, then simplify. And quickly, please - it hurts our eyes just to look at them. 


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