## Objective

**Lesson Objective**

“I can divide a given quantity into 2 parts in a given **part:part** or **part:whole ratio**“

This lesson is nice and simple. Your are given an amount and you need to split it into 2 parts when you are given one of two ratios:

**part to part ratio**

If I have 50 eggs and the part to part ratio is 2:3 hens eggs to duck eggs:

- 20 hens eggs and 30 duck eggs

**part to whole ratio**

In this one you need to calculate the missing part, which is easy because you just use subtraction.

If have a bag of 20 red and blue marbles and the part to whole ratio of red is 2:5, then the blue ratio amount must be 3 (5-2). Therefore the part to part ratio of red to blue is 2:3

this will mean that I have

- 8 red marbles
- 12 blue marbles