Without a calculator work out 0.5 multiplied by 0.8

So, we need to do this calculation!
0.5*0.8 = ? 

First we need to convert 0.5 and 0.8 into fractions. 
The first number after the decimal point (0.#) is in the tenths place, which is to say that the value there is 1/10 of 1. Simplified version... take the number (Example 5 in the number 0.5) and put it over 10. Do it for both numbers!



Before we multiply we should reduce them to simplest forms. 5/10 can be divided by 5 on both terms. 8/10 can be reduced by 2 on both terms. Let's look at the new problem: 


Multiply across! Multiply the numerator with the numerator, and denominator with the denominator... remember: 


= 

Reduce the fraction by dividing each number by 2. 
So our final answer is: 
 or 0.4