Ratios are really important when we want to compare sizes in scale drawings. They help us keep the correct size relationships between different parts.

Example:

Let's say we have a drawing of a room that is actually 6 meters long and 4 meters wide. If we use a ratio of 1:50, the sizes in our drawing will be:

• Length: 6m divided by 50 equals 0.12m
• Width: 4m divided by 50 equals 0.08m

Illustration:

This means that for every 1 unit in our drawing, it stands for 50 units in real life. By using ratios, we can easily see how the sizes in the drawing relate to the real sizes. This makes understanding scale drawings a lot easier!