Ratio
📚 What You'll Learn
- What a ratio means (for every 3 of one thing, you have 4 of another)
- How to find the total parts in a shape before decorating
- Using ratio tables to scale up to a target total
- Applying ratios to decorate shapes with the correct proportions
In this video, we're being asked to decorate this shape, but we're going to need to decorate it in a very specific way.
We need to use two colors in a three to four ratio.
Let's use the colors green and purple for this example.
What does a three to four ratio mean?
Well, for every three squares we color in green, we will need to color in four squares purple.
Before we start decorating the shape, our first step is to think about how many total parts are in the shape.
Forty two total parts. Let's represent this relationship in a table.
For every three parts green, we have four parts purple and that gives us a total of seven parts.
Of course, there are forty two parts in this whole shape, so we can either count up using this ratio until we reach the target of forty two, or think about how many times we need to count by seven parts until we reach a total of forty two parts.
Six times.
In order to maintain this ratio, we will need to multiply each part by six.
And now for the fun part, decorating the shape.
Eighteen green squares, twenty four purple squares, and that's a total of forty two parts.