Multiplying and dividing decimals

Multiplying and dividing decimals

Multiplying decimals

work this out mentally

12 x 0.6 =

solution:

12 x 6 = 72

12 x 0.6 = 7.2

Dividing decimals

 $\frac{36\ x\ 0.5\ }{0.2\ x\ 4.5}\ =$  

Solution: 
36 x 0.5 = 18 
2 x 4.5 = 9
so 0.2 x 4.5 = 0.9 

 $\frac{36\ x\ 0.5}{0.2\ x\ 4.5}=\frac{18}{0.9}$  

 $\frac{18\ x\ 10}{0.9\ x\ 10}=\frac{180}{9}=\ 20\$  

another example

 $16\div0.6\$  
solution: 

 $\frac{16\ \times10}{0.4\ \times10}=\frac{160}{4}$  

 $\frac{160}{4}=40$  

another example

 $8\ \div0.2$  
solution: 
 $\frac{8\ \times100}{0.02\times100}=\ \frac{800}{2}$  

 $\frac{800}{2}=400$  

Thank you