S4_General_Variation_TJ_Chapter17

# S4_General_Variation_TJ_Chapter17 - Direct Proportion S4

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13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Direct Proportion Direct Proportion www.mathsrevision.com Direct Variation Harder Direct Variation (extension) Direct Proportion   S4

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13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions www.mathsrevision.com 1 1 2 2 1. 2x + 13 = 51 3. 2 .   Calc ulat e  t h e  ar e a of  t h e  s h ape . 9 6 8 S4
13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Learning Intention Learning Intention Success Criteria Success Criteria 1. To explain the term Direct   Proportion. 1.  Understand the idea of Direct  Proportion. Direct Proportion Direct Proportion 2.  Solve simple Direct Proportional  problems. Direct Proportion S4

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13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Proportion Proportion “ . . When you double the number of cakes  you double the cost.” Cakes Cost  Two quantities,  (for example, number of cakes and total cost)  are said to be in DIRECT Proportion, if : Example  :  The cost of 6 cakes is £4.20. find the cost  of 5 cakes. 6   4.20  1 4.20  ÷ 6 = 0.70  5 0.70 x 5 = £3.50  Write down two  quantities that are in  direct proportion. S4
13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Proportion Proportion Example  :  Which of these pairs are in proportion. (a) 3 driving lessons for £60 : 5 for £90 (b) 5 cakes for £3 :  1 cake for 60p (c) 7 golf balls for £4.20 :  10 for £6 Same ratio means in  proportion S4

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13 Feb 2012 13 Feb 2012
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## S4_General_Variation_TJ_Chapter17 - Direct Proportion S4

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