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## Ratios

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**MNU 3-08a**MNU 4-08a Ratios Simplifying Ratios Ratio Calculations www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**MNU 3-08a**MNU 4-08a Starter Questions www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Ratios**What is a ratio ? MNU 3-08a MNU 4-08a Learning Intention Success Criteria • Understand the term ratio. . • 1. We are learning what a ratio. • 2. Calculate and simplify basic ratios. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Ratios**What is a ratio ? MNU 3-08a MNU 4-08a Ratios can be used to compare different quantities Example : There are 2 triangles and 3 rectangles. The ratio of triangles to rectangles is said to be 2 : 3 www.mathsrevision.com Note: The ratio of rectangles to triangles is said to be 3 : 2 Created by Mr. Lafferty Maths Dept.**Ratios**Simplifying a ratio ? MNU 3-08a MNU 4-08a Simplifying a ratio is like simplifying fractions Fraction : www.mathsrevision.com Ratio : Created by Mr. Lafferty Maths Dept.**Ratios**Simplifying a ratio ? MNU 3-08a MNU 4-08a Now try Exercise 1&2 Ch15 (page 175) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**MNU 3-08a**MNU 4-08a Starter Questions a 1 2 3 4 b 3 7 11 15 www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Ratios**Ratio Calculations MNU 3-08a MNU 4-08a Learning Intention Success Criteria • Apply tabular method to solve problems involving ratios. • 1 We are learning how to do ratio calculations. • 2. Show appropriate working. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**girls**boys Ratios Ratio Calculations MNU 3-08a MNU 4-08a Example : The ratio of boys to girls is 4:5. If there are 16 boys, how many girls are there. 4 5 www.mathsrevision.com x 4 x 4 16 20 Created by Mr. Lafferty Maths Dept.**buses**cars Ratios Ratio Calculations MNU 3-08a MNU 4-08a Example : The ratio of cars to buses is 3:7. If there are 49 buses, how many cars are there. 3 7 www.mathsrevision.com x 7 x 7 21 49 Created by Mr. Lafferty Maths Dept.**Ratios**Ratio Calculations MNU 3-08a MNU 4-08a Now try Exercise 3 Ch15 (page 179) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.