S1_Level_E_Ch15_Ratios (1)

S1_Level_E_Ch15_Ratios (1) - Ratios MNU 308a MNU 408a...

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Unformatted text preview: Ratios MNU 308a MNU 408a www.mathsrevision.com Simplifying Ratios Ratio Calculations 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Starter Questions 1. 3x + 5 = 17 2 . C a lc ula t e 2 0 % o f 2 2 0 3. How many signif icant number s (a) 123 (b) 202 (c) 0. 09 www.mathsrevision.com 4. Car depr eciat es by 20% in it s f ir st year . I f it was bought new f or 10 000. How much is it wor t h now. Created by Mr. Lafferty Maths Dept. 13 Feb 2012 MNU 308a MNU 408a What is a ratio ? Learning Intention Ratios Success Criteria 1. Understand the term ratio. . 2. Calculate and simplify basic ratios. www.mathsrevision.com 1. To understand what a ratio is and explain how we can sometimes simplify them. 13 Feb 2012 Created by Mr. Lafferty Maths Dept. MNU 308a MNU 408a What is a ratio ? Ratios Ratios can be used to compare different quantities www.mathsrevision.com 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 13 Feb 2012 Created by Mr. Lafferty Maths Dept. MNU 308a MNU 408a Simplifying a ratio ? Simplifying a ratio is like simplifying fractions Ratios www.mathsrevision.com Fraction : Ratio : 6 6 3 = 2 = 8 8 4 2 6 : 8 = 6 : 8 = 3 : 4 2 2 13 Feb 2012 Created by Mr. Lafferty Maths Dept. MNU 308a MNU 408a Simplifying a ratio ? Ratios www.mathsrevision.com Now try Exercise 1&2 Ch15 (page 175) 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Starter Questions 1. 3x + 5 = 17 www.mathsrevision.com 2 . Find t h e r ule c o nne c t ing a a nd b . 3. Round t o 1 decimal place (a) 0. 13 (b) 0. 02 (c) 1. 0 9 a 1 2 3 4 b 3 7 11 15 4. Simplif y f r act ion 12 30 13 Feb 2012 Created by Mr. Lafferty Maths Dept. MNU 308a MNU 408a Ratio Calculations Learning Intention Ratios Success Criteria 1. Use tabulating method to work out ratios. 2. Show appropriate working. www.mathsrevision.com 1. To show how to do ratio calculations. 13 Feb 2012 Created by Mr. Lafferty Maths Dept. MNU 308a MNU 408a Ratio Calculations Example : Ratios www.mathsrevision.com The ratio of boys to girls is 4:5. If there are 16 boys, how many girls are there. boys x 4 4 16 girls 5 20 x 4 13 Feb 2012 Created by Mr. Lafferty Maths Dept. MNU 308a MNU 408a Ratio Calculations Example : Ratios www.mathsrevision.com The ratio of cars to buses is 3:7. If there are 49 buses, how many cars are there. cars x 7 3 21 buses 7 49 x 7 13 Feb 2012 Created by Mr. Lafferty Maths Dept. MNU 308a MNU 408a Ratio Calculations Ratios www.mathsrevision.com Now try Exercise 3 Ch41 (page 160) 13 Feb 2012 Created by Mr. Lafferty Maths Dept. ...
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This note was uploaded on 02/13/2012 for the course REL133 133 taught by Professor Gaffney during the Spring '10 term at University of Phoenix.

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