# Unit: Ratio

## Lessons:

8 lessons

### Groups

In this lesson, you will learn to use ratio notation to describe the composition of different groups.

### In the same ratio

In this lesson, you will learn to scale up from one group to ‘many’ groups and use multiplicative relationships to calculate unknown values in the ‘many’ groups.

### Equivalent ratios

In this lesson, you will learn how to represent ratios pictorially and use these representations to justify the equivalence of ratios.

### The rule of four

In this lesson, you will identify multiplicative relationships between 'times tables' and use patterns to solve problems in direct proportion contexts.

### Ratio and proportion in geometry I

In this lesson, you will compare the side lengths of triangles, one of which is an enlargement of the other, and calculate the ratios of the lengths of corresponding sides.

### Ratio and proportion in geometry II

In this lesson, you will divide oblique line segments into specified ratios by dividing the segment’s horizontal and vertical displacements in the same ratio.

### Dividing into a ratio I

In this lesson, you will divide a quantity into a ratio of the form a : b and compare the relative sizes of the parts to each other and to the whole.

### Dividing into a ratio II

In this lesson, you will divide a quantity into a ratio of the form a : b : c and compare the relative sizes of the parts to each other and to the whole.