9-Aug-15Created by Mr. Lafferty Maths Dept. Units of length Perimeters Perimeter Perimeter Area Counting squares Area Rectangle Area of Triangle S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Q1.Calculate Q2.Find two numbers that multiply add to give 18 and subtract to give 3. Q3.Calculate Q4.Find 28.4 – 5.9 S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 1.To know the 4 units of length. 1. To explain the 4 metric units of length and how to convert between them. 2. Be able to convert between them. Units of Length S4

9-Aug-15Created by Mr. Lafferty Maths Dept. 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. This is of a metre and is about the width of your pinky nail. 100 th The centimetre : This is of a centimetre and is aboutthe width of a sewing needle. The Millimetre : This is of a centimetre and is aboutthe width of a sewing needle. The Kilometre : 1000 S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Units of Length Converting Measurements Units of Length Converting Measurements Kilometres (km) metres (m) centimetres (cm) millimetres (mm) S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Units of Length Converting Measurements Units of Length Converting Measurements Examples Convert 2m to cm : 2 x 100 = 200 cm Convert 4km to m : 4 x 1000 = 4000 m Convert 34cm to mm : 34 x 10 = 340 mm Convert 50cm to m : 50 ÷ 100 = 0.5 m S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 1.1 Ch3 (page 38) Units of Length Converting Measurements Units of Length Converting Measurements S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 1.To know the term perimeter of a shape. 1. To understand the term perimeter of a shape. 2. Calculate the perimeter of a shape. Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Perimeter What is perimeter ? Hint answer is on the screen ! S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Perimeter Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Perimeter Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Perimeter is the distance round the outside of a 2D shape Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. 6cm Calculate the perimeter of the rectangle below. 3cm Perimeter = = 18cm Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. 4cm 3cm 5cm Perimeter = =12cm Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Calculate the perimeter of the rectangle. 10cm 4cm Perimeter =28cm Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Calculate the perimeter of the triangle below. 5cm Perimeter = 20cm Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Below is a draw of the school building. Calculate the perimeter. Perimeter Problem 4 m 9 m 8 m x m 12 m 4 m x = 12 – 9 =3 m Perimeter = = 40 m S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 2 Ch3 (page 40) Perimeter S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Q1.Solve the equation below Q2.Find the missing angles Q3.Find the average of the numbers below Q4.Find aoao bobo 2,5,6,7 S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Area Counting Squares Learning Intention Success Criteria 1.To understand the term area. 1. To explain area in terms of counting squares. 2.Find the area by counting squares. S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Area Counting Squares 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 : 1cm 1cm 2 ( 1 square centimetre ) S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Now try Exercise 3.1 Ch3 (page 42) Area Counting Squares S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Q1.Calculate Q4.Convert 23metres to (a) cm (b)mm Q3. Q2.What is the time difference 09:28 and 11:55 Q5.The answer to the question is 180. What is the question. S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Area of a Rectangle Learning Intention Success Criteria 1.To be able to state area formula for a rectangle. 1. To come up with a formula for the area of a rectangle. 2.Use the formula to solve problems. 2.Apply formula correctly. (showing working) (showing working) 3.Answer containing appropriate units appropriate units S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Area of a Rectangle X = X = X= LAB L L L B B B L = length B = Breadth Must learn formula ! 1 cm Area = length x breadth A = L x B S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Area of a Rectangle Example Find the area of the rectangle opposite L = 9cm B = 2cm Area = Length x Breadth A = L x B A = 9 x 2 A = 18 cm 2 SC 1 SC 2 SC 3 Success Criteria S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Area of a Rectangle Example Find the length L of the rectangle opposite L B = 3cm Area = Length x Breadth A = L x B 36 = 12 x B Change side Change sign A = 36cm 2 Remember units S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Area of a Rectangle Now try Ex 5.1 & 5.2 Ch3 (page 45) S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Starter Questions Q1.Calculate Q4.Convert 57 metres to (a) cm (b)mm Q3. Q2.What is the perimeter and area of the rectangle. Q5.The answer to the question is 90. What is the question. 13cm 10cm S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Learning Intention Success Criteria 1.Know area of a right-angled triangle formula Use the area of a rectangle formula to help us to come up with a formula to calculate the area of any right-angled triangle. 1. Use the area of a rectangle formula to help us to come up with a formula to calculate the area of any right-angled triangle. 2.Use formula to work out area of triangle. 3.Show all working and units. Area of A Right-Angled Triangle S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Calculate the area of this shape 8cm A = l x b A = 10 x 8 A = 80cm 2 10cm Area of A Right-Angled Triangle S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Vertical Height base Area of A Right-Angled Triangle S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Calculate the area of this shape 12cm 6cm Area of A Right-Angled Triangle S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Calculate the area of this shape 3cm 4cm Area of A Right-Angled Triangle S4

9-Aug-15Created by Mr. Lafferty Maths Dept. Now try Ex 6 Ch3 (page 48) Area of A Right-Angled Triangle S4