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Mathsercise-C Proportion Ready? Here we go!. Proportion If 8 pens cost 72p, how much do 5 pens cost? 1 Answer Question 2 With these questions, it is best.

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Presentation on theme: "Mathsercise-C Proportion Ready? Here we go!. Proportion If 8 pens cost 72p, how much do 5 pens cost? 1 Answer Question 2 With these questions, it is best."— Presentation transcript:

1 Mathsercise-C Proportion Ready? Here we go!

2 Proportion If 8 pens cost 72p, how much do 5 pens cost? 1 Answer Question 2 With these questions, it is best to find out what one costs first, then find the cost of 5 72 ÷ 8 = 9p 9p x 5 = 45p One pen!

3 If 3 coffees cost £4.17, what would 7 coffees cost? 2 Proportion Answer Question 3 4.17 ÷ 3 = £1.39 £1.39 x 7 = £9.73 One coffee!

4 These two triangles are similar. Find the lengths of x and y 3 Proportion y 30 cm 20 cm 12 cm x 5 cm Answer Question 4 Similar means that one triangle is an enlargement of the other And..x = 20 ÷ 2.5 = 8cm 30 ÷ 12 = 2.5 scale factor So..y = 5 x 2.5 = 12.5cm

5 A photo is enlarged as shown.. 4 Show that these two rectangles are not similar Proportion 65 cm 50 cm 70 cm 90 cm Answer Start Use scale factors again like Q3 70 ÷ 50 = 1.4 Scale factor But 65 x 1.4 = 91, not 90 So they are not similar!

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