S3_Credit_Variation

S3_Credit_Variation - Direct Proportion Direct Proportion...

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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 Inverse Proportion Direct Proportion (Variation) Graph Direct Variation Direct Proportion   Inverse Proportion (Variation) Graph Inverse Variation Joint Variation
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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 (a) 0.13 (b) 0.02 (c) 1.09 1. 3x + 5 = 17 3. How many signif icant numbers 2 .   Calc ulat e  t h e  ar e a of t h e  s h ape . 9 6 8
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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 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
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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 Direct Proportion Direct 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 : Direct Proportion 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. Easier method Cakes Pence 6 420          5 Are we expecting  more or less 5 6 420 (less) 350 £3.50 = =
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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 Direct Proportion Direct Proportion Direct 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
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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 Direct Proportion Direct Proportion Direct Proportion Which graph is a direct proportion graph ? x y x y x y
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13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Now try Ex 1.1 Ch7 (page 125) www.mathsrevision.com Direct Proportion Direct Proportion Direct Proportion
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13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept.
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This note was uploaded on 02/13/2012 for the course HUM 400 taught by Professor Hum during the Spring '11 term at University of Phoenix.

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S3_Credit_Variation - Direct Proportion Direct Proportion...

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