Maths Problems

I am learning to know and understand Ratios.
A ratio says how much of one thing there is compared to another thing.

For example :
There are 3 blue squares to 1 Yellow square. Using the " : " to separate the values : 3 : 1
Instead of the " : " you use the word " to " : 3 to 1 or write it like a fraction. 3/1, 3 : 1.
A ratio can be scaled up.
Here the ratio is also 3 blue squares to 1 yellow square, even though there are more squares.

Using Ratios
The trick with ratios is to always multiply or divide the numbers by the same value.
Example :
4 : 5 is the same as 4 x 2 : 5 x 2 - 8 : 10
  4 : 5
x2 : 2
  8 : 10