Unformatted text preview: Perimeter
S4 Units of length
www.mathsrevision.com Perimeters Area Counting squares Area Rectangle Area of Triangle
13 Feb 2012 Created by Mr. Lafferty Maths Dept. Starter Questions
S4 Q1. Calculate Q2. www.mathsrevision.com 2 9 .3 + 17 .9 = Find two numbers that multiply add to give 18 and subtract to give 3. 28.4 5.9 Q3. Q4. Calculate Find 2 0 % o f 2 4 0
13 Feb 2012 Created by Mr. Lafferty Maths Dept. Units of Length
S4 Learning Intention Success Criteria 1. To know the 4 units of length. 2. Be able to convert between them. www.mathsrevision.com 1. To explain the 4 metric units of length and how to convert between them. 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Units of Length
S4 The 4 units of length are : The metre : This is the standard unit of length and is approximately the distance from your nose th 100 to the end of your outstretched arm. The centimetre : The Millimetre : 1000 The Kilometre :
13 Feb 2012 www.mathsrevision.com 1 This is of a metre and is about 10 0 the width of your pinky nail.
1 This is of a centimetre and is 10 about the width of a sewing needle.
10 0 0 This is of a centimetre and is about the width of a sewing needle.
Created by Mr. Lafferty Maths Dept. Units of Length Converting Measurements
S4 1000
Kilometres (km) 100
metres (m) www.mathsrevision.com 1000 100 10
centimetres (cm) 10
13 Feb 2012 Created by Mr. Lafferty Maths Dept. millimetres (mm) Units of Length Converting Measurements
S4 Examples www.mathsrevision.com Convert 2m to cm : Convert 4km to m : Convert 34cm to mm : Convert 50cm to m : 2 x 100 = 200 cm 4 x 1000 = 4000 m 34 x 10 = 340 mm 50 100 = 0.5 m 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Units of Length Converting Measurements
S4 www.mathsrevision.com Now try Exercise 1.1 Ch3 (page 38) 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Starter Questions
S4 1. 2 .3 x 8 2 . C o nve r t m e t r e s ( m ) www.mathsrevision.com ( a ) 2 0 0 c m ( b ) 5 5 0 c m ( c ) 5 0 c m 3 3 . o f 3 2 0 4
4 . Find 2 num b e r s t h a t a d d t o g ive 7 a nd m ult ip ly t o g ive 10 .
13 Feb 2012 Created by Mr. Lafferty Maths Dept. Perimeter
S4 Learning Intention Success Criteria 1. To know the term perimeter of a shape. 2. Calculate the perimeter of a shape. www.mathsrevision.com 1. To understand the term perimeter of a shape. 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Perimeter
S4 www.mathsrevision.com What is perimeter ?
Hint answer is on the screen !
13 Feb 2012 Created by Mr. Lafferty Maths Dept. Perimeter
S4 www.mathsrevision.com 13 Feb 2012 Perimeter
Created by Mr. Lafferty Maths Dept. Perimeter
S4 www.mathsrevision.com Perimeter
13 Feb 2012 Created by Mr. Lafferty Maths Dept. Perimeter
S4 www.mathsrevision.com is the distance round the outside of a 2D shape 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Perimeter Perimeter
S4 www.mathsrevision.com 6cm 3cm
Perimeter = 13 Feb 2012 Calculate the perimeter of the rectangle below. 6 + 3 + 6 + 3 = 18cm
Created by Mr. Lafferty Maths Dept. Perimeter
S4 3cm
www.mathsrevision.com 5cm 4cm Perimeter = 13 Feb 2012 3 + 5 + 4 = 12cm
Created by Mr. Lafferty Maths Dept. Perimeter
S4 10cm
www.mathsrevision.com Calculate the perimeter of the rectangle. 4cm Perimeter =
13 Feb 2012 28cm
Created by Mr. Lafferty Maths Dept. Perimeter
S4 www.mathsrevision.com Calculate the perimeter of the triangle below. 5cm Perimeter = 20cm 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Perimeter
S4 Problem
www.mathsrevision.com x m Below is a draw of the school building. Calculate the perimeter. 4 m 9 m 4 m 12 m = 12 + 8 + 3 + 4 + 9 + 4
Created by Mr. Lafferty Maths Dept. x = 12 9 =3 m 8 m Perimeter 13 Feb 2012 = 40 m Perimeter
S 4 www.mathsrevision.com Now try Exercise 2 Ch3 (page 40) 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Starter Questions
S4 Q1. Q2. Q3. Q4. Solve the equation below Find the missing angles x +21 = 32 a o b o Find the average of the numbers below
2,5,6,7 Find 7 5 % o f 2 4 0
13 Feb 2012 Created by Mr. Lafferty Maths Dept. Area Counting Squares
S4 Learning Intention Success Criteria 1. To understand the term area. 2. Find the area by counting squares. www.mathsrevision.com 1. To explain area in terms of counting squares. 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Area Counting Squares
S4 The area of a shape is simply defined by : www.mathsrevision.com "the amount of space a shape takes up."
Think of a square measuring 1 cm by 1cm we say it is : 1cm 1cm
13 Feb 2012 Created by Mr. Lafferty Maths Dept. ( 1 square centimetre ) 1cm 2 Area Counting Squares
S 4 www.mathsrevision.com Now try Exercise 3.1 Ch3 (page 42) 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Starter Questions
S4 Q1. Calculate Q2. 2 6 6 % o f 2 7 0 3 www.mathsrevision.com What is the time difference 09:28 and 11:55 Q3. Q4. S o lve 3 x  2 1 = 9
Convert 23metres to (a) cm (b) mm The answer to the question is 180. What is the question.
Created by Mr. Lafferty Maths Dept. Q5.
13 Feb 2012 Area of a Rectangle
S4 Learning Intention Success Criteria 1. To be able to state area formula for a rectangle. 2. Apply formula correctly. (showing working) 3. Answer containing appropriate units www.mathsrevision.com 1. To come up with a formula for the area of a rectangle. 2. Use the formula to solve problems. 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Area of a Rectangle
S4 1 cm www.mathsrevision.com B L L = length B = Breadth L 3
13 Feb 2012 B L L B X 1 X 3 X 2 A 3 Area = length x breadth A = L x B B = = 4 3 12 = 6 Created by Mr. Lafferty Maths Dept. Must learn formula ! Area of a Rectangle
S4 Example Find the area of the rectangle opposite www.mathsrevision.com B = 2cm L = 9cm Area = Length x Breadth A = L x B A = 9 x 2 A = 18 cm
13 Feb 2012 SC 1 2 SC 2 Success Criteria SC 3
Created by Mr. Lafferty Maths Dept. Area of a Rectangle
S4 Example Find the length L of the rectangle opposite B = 3cm www.mathsrevision.com A = 36cm L 2 Area = Length x Breadth A = L x B 36 = 12 x B Change side Change sign 36 B = 12 B = 3 c m
13 Feb 2012 Created by Mr. Lafferty Maths Dept. Remember units Area of a Rectangle
S4 www.mathsrevision.com Now try Ex 5.1 & 5.2 Ch3 (page 45) 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Starter Questions
S4 Q1. Calculate 10 % o f 2 2 0 Q2. What is the perimeter and area of the rectangle.
13cm 10cm www.mathsrevision.com Q3. Q4. S o lve 6 x  6 4 = 8
Convert 57 metres to (a) cm (b) mm Q5.
13 Feb 2012 The answer to the question is 90. What is the question.
Created by Mr. Lafferty Maths Dept. Area of A RightAngled Triangle
S4 Learning Intention Success Criteria 1. Know area of a rightangled triangle formula 2. Use formula to work out area of triangle. 3. Show all working and units. www.mathsrevision.com 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. 13 Feb 2012 Created by Mr. Lafferty Maths Dept. S4 Area of A RightAngled Triangle
Calculate the area of this shape www.mathsrevision.com A = l x b
8cm A = 10 x 8 A = 80cm2 13 Feb 2012 10cm Created by Mr. Lafferty Maths Dept. S4 Area of A RightAngled Triangle
1 A r e a= b as e h e ig h t 2 www.mathsrevision.com Vertical Height 1 A = b h 2 13 Feb 2012 Created by Mr. Lafferty Maths Dept. base S4 Area of A RightAngled Triangle
Calculate the area of this shape www.mathsrevision.com 12cm 1 A = b h 2 1 A = 6 12 2 A =3 6 c m
13 Feb 2012 2 6cm Created by Mr. Lafferty Maths Dept. S4 Area of A RightAngled Triangle
Calculate the area of this shape www.mathsrevision.com 3cm 1 A = b h 2
1 A = 4 3 2 4cm A =6 c m
13 Feb 2012 Created by Mr. Lafferty Maths Dept. 2 S4 Area of A RightAngled Triangle www.mathsrevision.com Now try Ex 6 Ch3 (page 48) 13 Feb 2012 Created by Mr. Lafferty Maths Dept. ...
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 Spring '10
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 Orders of magnitude, 1 cm, 10cm, 10 %, 2 0 %, 7 5 %

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