Perimeter

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# Perimeter

## Perimeter

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##### Presentation Transcript

1. Perimeter Measuring Length Units of length Problem Solving Length Perimeters www.mathsrevision.com Area Counting squares Area Rectangle Area of Triangle Created by Mr. Lafferty Maths Dept.

2. Starter Questions Q1. Solve the equation 3a = 27 Q2. Find two numbers that multiply to give 18 and subtract to give 3. www.mathsrevision.com Q3. Solve the equation x – 30 = 55 Q4. True or false 4 x 5 + 7 = 27 Created by Mr. Lafferty Maths Dept.

3. Measuring Length Learning Intention Success Criteria • Be able identify units on a ruler. • 1 We are learning how to measure length. 2. Be able to measure accurately length of an object. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

4. Start at 0 NOT the edge of the ruler Measuring a Line 13cm 8.5cm

5. Measuring a Line 6.2cm 2.6cm

6. Measuring a Line 3.9 cm 9.1 cm

7. Drawing Lines Draw a line 4.2 cm Draw a line 9.4 cm

8. Measuring Length Now try TJ2a Ex 1 Ch13a (page 113) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

9. Starter Questions Q1. ¼ of 56 Q2. Find two numbers that multiply to give 10 and add to give 7. www.mathsrevision.com Q3. Solve the equation x + 26 = 67 Q4. True or false 7 x 7 + 1 = 51 Created by Mr. Lafferty Maths Dept.

10. Units of Length Learning Intention Success Criteria • Remember the 4 units of length. • 1 We are learning the 4 metric units of length. 2. Be able to convert between them. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

11. This is of a centimetre and is about the width of a sewing needle. Units of Length The 4 units of length are : The metre : This is the standard unit of length and is approximately the distance from your nose to the end of your outstretched arm. 100th The centimetre : This is of a metre and is about the width of your pinky nail. www.mathsrevision.com The Millimetre : 1000 The Kilometre : This is metres and is about the length of 10 football pitches. Created by Mr. Lafferty Maths Dept.

12. Units of Length Converting Measurements Kilometres (km) metres (m) www.mathsrevision.com centimetres (cm) millimetres (mm) Created by Mr. Lafferty Maths Dept.

13. Units of Length Converting Measurements Examples Convert 2m to cm : 2 x 100 = 200 cm Convert 4km to m : 4 x 1000 = 4000 m www.mathsrevision.com Convert 34cm to mm : 34 x 10 = 340 mm Convert 50cm to m : 50 ÷ 100 = 0.5 m Created by Mr. Lafferty Maths Dept.

14. Units of Length Converting Measurements Now try TJ2a Ex 2 Ch13 (page 116) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

15. Starter Questions Q1. Solve the equation 6a = 96 Q2. Find two numbers that multiply to give 24 and subtract to give 5. www.mathsrevision.com Q3. Solve the equation x – 14 = 13 Q4. True or false 6 x 8 - 9 = 41 Created by Mr. Lafferty Maths Dept.

16. Units of Length Learning Intention Success Criteria • Read questions carefully. • 1 We are problem solving involving length. 2. Be able solve context problems involving length. www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

17. Units of Length A set of baby blocks are stacked one on top of the other. The length of the large cube is 20cm , medium 13cm and the small is 8cm. How high is the stack ? www.mathsrevision.com 4 1 Created by Mr. Lafferty Maths Dept.

18. Units of Length A joiner needs a length of wood 173cm long. He only has a length of wood 2m long. How many centimetres will he need to cut off the 2m length ? 2m = 200cm www.mathsrevision.com 2 7 Created by Mr. Lafferty Maths Dept.

19. Units of Length Converting Measurements Now try TJ2a Ex 3 Ch13a (page 118) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

20. Starter Questions Q1. True or false 2.3 x 8 = 18.4 Q2. Convert 5.4km to m www.mathsrevision.com Q3. Solve the equation 2c = 34 Q4. True or false 2 x 15 + 7 = 37 Created by Mr. Lafferty Maths Dept.

21. Perimeter Learning Intention Success Criteria • Understand the term perimeter of a shape. • 1. We are learning the term perimeter of a shape. www.mathsrevision.com 2. Calculate the perimeter of a shape. Created by Mr. Lafferty Maths Dept.

22. Perimeter What is perimeter ? www.mathsrevision.com Hint answer is on the screen ! Created by Mr. Lafferty Maths Dept.

23. Perimeter www.mathsrevision.com Perimeter Created by Mr. Lafferty Maths Dept.

24. Perimeter www.mathsrevision.com Perimeter Created by Mr. Lafferty Maths Dept.

25. Perimeter Perimeter is the distance round the outside of a2D shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

26. Perimeter 6cm Calculate the perimeter of the rectangle below. 3cm Demo www.mathsrevision.com Perimeter = 6 + 3 + 6 + 3 18cm = Created by Mr. Lafferty Maths Dept.

27. x m 4 m 9 m 8 m 4 m Perimeter 12 m Perimeter Problem Below is a drawing of the school building. Calculate the perimeter. x = 12 – 9 =3 m www.mathsrevision.com = 12 + 8 + 3 + 4 + 9 + 4 = 40 m Created by Mr. Lafferty Maths Dept.

28. Perimeter Now try TJ2a Ex 4 Ch13a (page 119) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

29. Starter Questions Q1. 25% of 360 Q2. Convert 7.2km to m www.mathsrevision.com Q3. Solve the equation 8a = 72 Q4. True or false 3 x 9 + 7 = 35 Created by Mr. Lafferty Maths Dept.

30. Area Counting Squares Learning Intention Success Criteria • To understand the term area. • 1 We are learning the term area. www.mathsrevision.com • Find the area by counting squares. Created by Mr. Lafferty Maths Dept.

31. Area Counting Squares 1cm 1cm The area of a shape is simply defined by : “the amount of space a shape takes up.” Think of a square measuring 1 cm by 1cm we say it is : www.mathsrevision.com 1cm2 ( 1 square centimetre ) Created by Mr. Lafferty Maths Dept.

32. Calculate the area of the yellow shapes. 8 cm2 8 cm2 Created by Mr. Lafferty Maths Dept.

33. Calculate the area of the yellow shapes. 13 cm2 3 cm2 Created by Mr. Lafferty Maths Dept.

34. Area Counting Squares Now try TJ2a Ex 1 Ch13b (page 122) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

35. Starter Questions Q1. 10% of 120 Q2. Convert 3.5km to m www.mathsrevision.com Q3. The answer to the question is 90. What is the question. Created by Mr. Lafferty Maths Dept.

36. Area of a Rectangle Learning Intention Success Criteria • Remember area formula for a rectangle. • 1. Develop a formula for the area of a rectangle. • Apply formula correctly. • (showing working) www.mathsrevision.com • Answer containing • appropriate units Created by Mr. Lafferty Maths Dept.

37. Area of a Rectangle 1 cm Area = length x breadth L B A A = L x B = X = X = X B B L L L = length www.mathsrevision.com L B B = Breadth 3 1 3 4 3 12 Must learn formula ! 3 2 6 Created by Mr. Lafferty Maths Dept.

38. Area of a Rectangle Example Find the area of the rectangle opposite B = 2cm L = 9cm Area = Length x Breadth A = L x B www.mathsrevision.com A = 9 x 2 A = 18 cm2 Demo Created by Mr. Lafferty Maths Dept.

39. Area of a Rectangle Example Find the breadth b of the rectangle. b cm A = 36cm2 A = l x b 9cm 36 = 9 x b www.mathsrevision.com 9b = 36 Remember units (÷9) b = 4 cm Created by Mr. Lafferty Maths Dept.

40. John wants to re-turf his lawn. (a) Calculate the area he needs to cover in m2. A = l x b = 7 x 3 = 21m2 Created by Mr. Lafferty Maths Dept.

41. Given one roll of turf covers 3m2. • How many rolls will John need. • Calculate the total cost if one roll of turf costs £14.40. 7 rolls 14.40 x7 £100.80 Created by Mr. Lafferty Maths Dept.

42. Area Now try TJ2a Ex 2 Ch13b (page 124) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

43. Starter Questions Q1. Calculate 50% of £90 Q2. True or false the perimeter of the shape is 130cm and the area is 46cm. 13cm www.mathsrevision.com 10cm Q3. Convert 5.7m to cm Created by Mr. Lafferty Maths Dept.

44. Area of A Right-Angled Triangle Learning Intention Success Criteria • Remember the area formula for a right-angled triangle. • Develop the formula for the area of any • right-angled triangle. 2. Use formula to work out area of triangle. www.mathsrevision.com 3. Show all working and units. Created by Mr. Lafferty Maths Dept.

45. Area of A Right-Angled Triangle Calculate the area of this shape A = l x b A = 10 x 8 8cm www.mathsrevision.com A = 80cm2 10cm Created by Mr. Lafferty Maths Dept.

46. Area of A Right-Angled Triangle Vertical Height www.mathsrevision.com Demo base Created by Mr. Lafferty Maths Dept.

47. 6cm 12cm Area of A Right-Angled Triangle Calculate the area of this shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

48. 4cm 3cm Area of A Right-Angled Triangle Calculate the area of this shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

49. Area Now try TJ2a Ex 3 Q4 Ch13b (page 127) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.