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20 5 24p or 024 25p or 025 1 balloon 150 6 best

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Unformatted text preview: Which is the better buy? www.mathsrevision.com Tea box A costs 2.88 and holds 160 tea bags. Tea box B costs 3.84 and holds 240 tea bags. Answer : (i) (ii) Box A Box B 2.88 160 = 1.8p per bag 3.84 240 = 1.6p per bag Best buy is Box B since it costs only 1.6p per bag Monday, February 13, 2012 Created by Mr. Lafferty @www.mathsrevision.com 30 Using the Rate S4 www.mathsrevision.com Now try Ex 5.1 Ch 2 (page 25) Monday, February 13, 2012 Created by Mr. Lafferty @www.mathsrevision.com 31 Starter Questions S4 1. Find 5 0 % o f 9 5 2 . f ind t h e t im e d if f e r e nc e b e t we e n 0 8 .3 0 and 16 .3 9 3 . W h at is t h e b e t t e r d e al 3 b ar s o f s o ap f o r 9 9 p o r 4 b ar s o f 1.4 0 4 . Monday, February 13, 2012 www.mathsrevision.com 1 o f 2 4 0 5 Created by Mr. Lafferty @www.mathsrevision.com 32 In Proportion S4 Learning Intention Success Criteria 1. Understand the term proportion. 2. Solve problems using proportion. www.mathsrevision.com 1. To be able to identify simple connections between two quantities. Monday, February 13, 2012 Created by Mr. Lafferty @www.mathsrevision.com 33 In Proportion S4 If two quantities are in proportion then there is a connection between them. Example : Jake mixes sand and cement to make a patio. He uses 1 part sand and 3 parts cement. This means for every shovel of sand he must use 3 shovels of cement For every 1kg of sand he must use 3 kg of cement. How much cement for 5kg of sand : Monday, February 13, 2012 Created by Mr. Lafferty @www.math...
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