1. 19-Dec-14Created by Mr. Lafferty Maths Dept. Simplifying Ratios Ratio Calculations Ratios www.mathsrevision.com MNU 3-08a MNU 4-08a

2. 19-Dec-14Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions www.mathsrevision.com MNU 3-08a MNU 4-08a

3. 19-Dec-14Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Learning Intention Success Criteria 1.Understand the term ratio.. 1. We are learning what a ratio. Ratios 2.Calculate and simplify basic ratios. What is a ratio ? MNU 3-08a MNU 4-08a

4. 19-Dec-14Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Ratios Ratios can be used to compare different quantities What is a ratio ? Example : There are 2 triangles and 3 rectangles. The ratio of triangles to rectangles is said to be 2 : 3 Note: The ratio of rectangles to triangles is said to be 3 : 2 MNU 3-08a MNU 4-08a

5. 19-Dec-14Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Ratios Simplifying a ratio is like simplifying fractions Simplifying a ratio ? Fraction : Ratio : MNU 3-08a MNU 4-08a

6. 19-Dec-14Created by Mr. Lafferty Maths Dept. Now try Exercise 1&2 Ch15 (page 175) www.mathsrevision.com Ratios Simplifying a ratio ? MNU 3-08a MNU 4-08a

7. 19-Dec-14Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions www.mathsrevision.com 1432a 315117b MNU 3-08a MNU 4-08a

8. 19-Dec-14Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Learning Intention Success Criteria 1.Apply tabular method to solve problems involving ratios. 1 We are learning how to do ratio calculations. Ratios 2.Show appropriate working. Ratio Calculations MNU 3-08a MNU 4-08a

9. 19-Dec-14Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Ratios Ratio Calculations Example :The ratio of boys to girls is 4:5. If there are 16 boys, how many girls are there. boys girls 45 1620 x 4 x 4 MNU 3-08a MNU 4-08a

10. 19-Dec-14Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Ratios Ratio Calculations Example :The ratio of cars to buses is 3:7. If there are 49 buses, how many cars are there. cars buses 37 2149 x 7 x 7 MNU 3-08a MNU 4-08a

11. 19-Dec-14Created by Mr. Lafferty Maths Dept. Now try Exercise 3 Ch15 (page 179) www.mathsrevision.com Ratios Ratio Calculations MNU 3-08a MNU 4-08a