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## Perimeter

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**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.**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.**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.**Start at 0 NOT the edge of the ruler**Measuring a Line 13cm 8.5cm**Measuring a Line**6.2cm 2.6cm**Measuring a Line**3.9 cm 9.1 cm**Drawing Lines**Draw a line 4.2 cm Draw a line 9.4 cm**Measuring Length**Now try TJ2a Ex 1 Ch13a (page 113) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**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.**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.**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.**Units of Length Converting Measurements**Kilometres (km) metres (m) www.mathsrevision.com centimetres (cm) millimetres (mm) Created by Mr. Lafferty Maths Dept.**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.**Units of Length Converting Measurements**Now try TJ2a Ex 2 Ch13 (page 116) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**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.**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.**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.**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.**Units of Length Converting Measurements**Now try TJ2a Ex 3 Ch13a (page 118) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**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.**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.**Perimeter**What is perimeter ? www.mathsrevision.com Hint answer is on the screen ! Created by Mr. Lafferty Maths Dept.**Perimeter**www.mathsrevision.com Perimeter Created by Mr. Lafferty Maths Dept.**Perimeter**www.mathsrevision.com Perimeter Created by Mr. Lafferty Maths Dept.**Perimeter**Perimeter is the distance round the outside of a2D shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**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.**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.**Perimeter**Now try TJ2a Ex 4 Ch13a (page 119) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**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.**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.**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.**Calculate the area of the yellow shapes.**8 cm2 8 cm2 Created by Mr. Lafferty Maths Dept.**Calculate the area of the yellow shapes.**13 cm2 3 cm2 Created by Mr. Lafferty Maths Dept.**Area Counting Squares**Now try TJ2a Ex 1 Ch13b (page 122) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**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.**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.**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.**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.**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.**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.**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.**Area**Now try TJ2a Ex 2 Ch13b (page 124) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**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.**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.**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.**Area of A Right-Angled Triangle**Vertical Height www.mathsrevision.com Demo base Created by Mr. Lafferty Maths Dept.**6cm**12cm Area of A Right-Angled Triangle Calculate the area of this shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**4cm**3cm Area of A Right-Angled Triangle Calculate the area of this shape www.mathsrevision.com Created by Mr. Lafferty Maths Dept.**Area**Now try TJ2a Ex 3 Q4 Ch13b (page 127) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.