4.5/45 simplified?

Start by multiplying the top and bottom by 10.

 

$$\frac{4.5}{45}$$

 

$$\frac{4.5\times10}{45\times10}$$

 

$$\frac{45}{450}$$

 

Divide the top and bottom by 45

 

$$\frac{1}{10}$$

4.5 is the same as 45/10 so if we split 4.5/45 into two fractions:

45/10 * 1 / 45

45/450

 

Divide both the top and bottom by 45:

 

1 / 10.