**Writing and Simplifying Ratio**

Starter

Simplifying Ratio

**L.O. - To write ratio and simplify ratio.**

Main Activity 2

Red

Amber

Green

Examples

Simplify:

15 : 25

60 : 72

12 : 16 : 28

Main Activity 2 Answers

Red

Amber

Green

Red: (1) 16 children (2) 7 adults

Amber (3) 30 children (4) 10 children.

Green (5) 12 children (24 in first nursery,

36 in the second).

Dice of Ultimate Power

1) Give a key word for the lesson.

2) Summarise one key point for the

lesson.

3) Explain one thing you have learned this

lesson.

4) State one thing you still don't understand following this lesson.

5) Suggest one thing you would like to find out

based on this lesson.

6) Free choice from 1 to 5, or another you make

up.

Simplifying Ratio

Examples

Simplify:

15 : 25

3:5

60 cm : 7.2 m

1:12

12 : 16 : 28

3:4:7

For each picture, write: (a) the fraction shaded

(b) the fraction not shaded

Starter

For each picture, write: (a) the fraction shaded

(b) the fraction not shaded

3 5

8 8

7 3

10 10

Starter

For each picture, write: (a) the fraction shaded

(b) the fraction not shaded

3 5

8 8

7 3

10 10

What is the ratio of shaded to unshaded in each picture?

Starter

For each picture, write: (a) the fraction shaded

(b) the fraction not shaded

3 5

8 8

7 3

10 10

What is the ratio of shaded to unshaded in each picture?

3:5

7:3

Writing Ratio

What is the ratio of

the distance across

to the distance up?

Writing Ratio

What is the ratio of

the distance across

to the distance up?

2:1

Writing Ratio

Write the ratio of the

shaded to unshaded parts

Write the ratio of the distances across to up.

Writing Ratio

Write the ratio of the

shaded to unshaded parts

Write the ratio of the distances across to up.

2:6

3:2

11:13

10:17

9:7

18:46

4:3

3:7

3:1

5:1

4:3

2:1

4:2

6:3

How does this

diagram show that

all 3 ratios are

equivalent?

Simplifying Ratio

2:1

4:2

6:3

How does this

diagram show that

all 3 ratios are

equivalent?

Which ratio simplifications do these

diagrams show?

Simplifying Ratio

Which ratio simplifications do these

diagrams show?

2:6 = 1:3

10:2 = 5:1

4:8 = 3:6 = 2:4 = 1:2

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