AI Tutor
Imagine you are building a bridge for toy cars that is 200 cm200\text{ cm} long, but you have only built 40%40\% of it. How many centimeters of track are ready?
Finding a percentage of a length just means finding a specific slice of that whole distance.
How do we find friendly building blocks like 10%10\% and 1%1\% of any measurement?

Friendly Percentage Building Blocks

The word percent means 'parts out of 100100'. That means 100%100\% is the full length.
To find 10%, divide the total length by 1010. To find 1%, divide the total length by 100100.
What happens when we need to find an amount like 35%35\% of an 80 cm80\text{ cm} piece of ribbon?

Example 1: Finding Centimetres

Let's find 35%35\% of 80 cm80\text{ cm}. First, find 10%10\% by dividing 80 cm80\text{ cm} by 1010, which gives 8 cm8\text{ cm}.
Multiply 8 cm×38\text{ cm} \times 3 to get 30%=24 cm30\% = 24\text{ cm}. Then take half of 8 cm8\text{ cm} to get 5%=4 cm5\% = 4\text{ cm}.
Now add those chunks together: 24 cm+4 cm=28 cm24\text{ cm} + 4\text{ cm} = 28\text{ cm}.