1. Created by Mr. Lafferty Maths Dept.
Perimeter
Units of length
Perimeters
Area Counting squares
Area Rectangle
Composite Areas
Area of Triangle
Carpet Problem
19-Apr-17
Created by Mr. Lafferty Maths Dept.

2. Created by Mr. Lafferty Maths Dept.
Starter Questions
MNU 2-11b
MNU2-11c
MTH 3-11b
Q1. Solve the equation below
Q2. Find two numbers that multiply to give 18
and subtract to give 3.
Q3. Explain why the average of the numbers below is 7
2,8,8,10
Q4. True or false
19-Apr-17
Created by Mr. Lafferty Maths Dept.

3. Created by Mr. Lafferty Maths Dept.
Units of Length
Learning Intention
Success Criteria
1 We are learning the 4 metric units of length.
Remember the 4 units of length.
2. Be able to convert between them.
19-Apr-17
Created by Mr. Lafferty Maths Dept.

4. Created 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.
100th
The centimetre :
This is of a metre and is about
the width of your pinky nail.
The Millimetre :
This is of a centimetre and is
about the width of a sewing needle.
1000
The Kilometre :
This is metres and is about the
length of 10 football pitches.
19-Apr-17
Created by Mr. Lafferty Maths Dept.

5. Units of Length Converting Measurements
Kilometres
(km)
metres
(m)
centimetres
(cm)
millimetres
(mm)
19-Apr-17
Created by Mr. Lafferty Maths Dept.

6. 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
19-Apr-17
Created by Mr. Lafferty Maths Dept.

7. Units of Length Converting Measurements
MNU 2-11b
MNU2-11c
MTH 3-11b
Now try Exercise 1 Ch10 (page 118)
19-Apr-17
Created by Mr. Lafferty Maths Dept.

8. Created by Mr. Lafferty Maths Dept.
Starter Questions
19-Apr-17
Created by Mr. Lafferty Maths Dept.

9. Created by Mr. Lafferty Maths Dept.
Perimeter
Learning Intention
Success Criteria
1. We are learning the term perimeter of a shape.
Understand the term perimeter of a shape.
2. Calculate the perimeter of a shape.
19-Apr-17
Created by Mr. Lafferty Maths Dept.

10. Created by Mr. Lafferty Maths Dept.
Perimeter
MNU 2-11b
MNU2-11c
MTH 3-11b
What is perimeter ?
Hint
answer is on the screen !
19-Apr-17
Created by Mr. Lafferty Maths Dept.

11. Created by Mr. Lafferty Maths Dept.
Perimeter
Perimeter
19-Apr-17
Created by Mr. Lafferty Maths Dept.

12. Created by Mr. Lafferty Maths Dept.
Perimeter
MNU 2-11b
MNU2-11c
MTH 3-11b
Perimeter
19-Apr-17
Created by Mr. Lafferty Maths Dept.

13. Perimeter Perimeter is the distance round the outside of a 2D shape
MNU 2-11b
MNU2-11c
MTH 3-11b
Perimeter
is the distance round the outside of a 2D shape
19-Apr-17
Created by Mr. Lafferty Maths Dept.

14. Created by Mr. Lafferty Maths Dept.
Perimeter
MNU 2-11b
MNU2-11c
MTH 3-11b
6cm
Calculate the perimeter of the rectangle below.
3cm
Demo
Perimeter =
6 +
3 +
6 + 3
18cm =
19-Apr-17
Created by Mr. Lafferty Maths Dept.

15. Created by Mr. Lafferty Maths Dept.
Perimeter
MNU 2-11b
MNU2-11c
MTH 3-11b
Problem
Below is a drawing of the school building. Calculate the perimeter.
4 m
9 m
8 m
x m
12 m
x = 12 – 9 =3 m
Perimeter =
= 40 m
19-Apr-17
Created by Mr. Lafferty Maths Dept.

16. Perimeter Now try Exercise 2 Ch10 (page 121) www.mathsrevision.com
MNU 2-11b
MNU2-11c
MTH 3-11b
Now try Exercise 2 Ch10 (page 121)
19-Apr-17
Created by Mr. Lafferty Maths Dept.

17. Created by Mr. Lafferty Maths Dept.
Starter Questions
MNU 2-11b
MNU2-11c
MTH 3-11b
Q1. Solve the equation below ao
Q2. Find the missing angles bo
Q3. Find the average of the numbers below
2,5,6,7
Q4. Which is the better deal or
19-Apr-17
Created by Mr. Lafferty Maths Dept.

18. Created by Mr. Lafferty Maths Dept.
Area Counting Squares
Learning Intention
Success Criteria
1 We are learning the term area.
To understand the term area.
Find the area by counting squares.
19-Apr-17
Created by Mr. Lafferty Maths Dept.

19. Created 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
1cm2
( 1 square centimetre )
19-Apr-17
Created by Mr. Lafferty Maths Dept.

20. Now try Exercise 3 Ch10 (page 123)
Area Counting Squares
MNU 2-11b
MNU2-11c
MTH 3-11b
Now try Exercise 3 Ch10 (page 123)
19-Apr-17
Created by Mr. Lafferty Maths Dept.

21. Created by Mr. Lafferty Maths Dept.
Starter Questions
Q1. What is the time difference 09:28 and 11:55
Q2.
Q3. Convert 23metres to
(a) cm (b) mm
Q4. The answer to the question is 180.
What is the question.
19-Apr-17
Created by Mr. Lafferty Maths Dept.

22. Created by Mr. Lafferty Maths Dept.
Area of a Rectangle
Learning Intention
Success Criteria
1. Develop a formula for the area of a rectangle.
Remember area formula for a rectangle.
Apply formula correctly.
(showing working)
Answer containing
appropriate units
19-Apr-17
Created by Mr. Lafferty Maths Dept.

23. Created by Mr. Lafferty Maths Dept.
Area of a Rectangle
1 cm B B L L
L = length
B = Breadth L B
Area = length x breadth
A = L x B L A B 3 X = 1 3 4 X = 3 12
Must learn formula ! 3 X = 2 6
19-Apr-17
Created by Mr. Lafferty Maths Dept.

24. 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
A = 9 x 2
A = 18 cm2
Demo
19-Apr-17
Created by Mr. Lafferty Maths Dept.

25. Created by Mr. Lafferty Maths Dept.
Area of a Rectangle
Example
Find the breadth B of the rectangle opposite
B cm
A = 36cm2
L = 12cm
Area = Length x Breadth
Balancing Method
A = L x B
36 = 12 x B
Remember units
19-Apr-17
Created by Mr. Lafferty Maths Dept.

26. Now try Exercise 4 Ch10 (page 125)
Area of a Rectangle
Now try Exercise 4 Ch10 (page 125)
19-Apr-17
Created by Mr. Lafferty Maths Dept.

27. C of E Task The desks in your group
Now find the area of your composite shape.
How many different ways can you find the area.
Measure the length of one desk and round answer to the nearest ten.
Now find the perimeter of your shape.
Using an appropriate scale make a scale drawing of your shape.
C of E Task
The desks in your group
have been arranged in a certain way
19-Apr-17
Created by Mr. Lafferty Maths Dept.

28. Created by Mr. Lafferty Maths Dept.
Starter Questions
Q1. Why is
Q2. What is the time difference 07:54 and 13:36
Q3.
Q4. Convert 45.1 metres to
(a) cm (b) mm
Q5. The answer to the question is 90.
What is the question.
19-Apr-17
Created by Mr. Lafferty Maths Dept.

29. Created by Mr. Lafferty Maths Dept.
Area of a Composite
Made up of
Simple shapes
Learning Intention
Success Criteria
1. We are learning to find area for more complicated shapes.
Use knowledge gained so far to find the area of more complicated shapes..
Show appropriate working.
19-Apr-17
Created by Mr. Lafferty Maths Dept.

30. Created by Mr. Lafferty Maths Dept.
Area of a Composite
MNU 2-11b
MNU2-11c
MTH 3-11b
Calculate the area of this shape
Total Area =
9cm
8cm
= 102cm2
A = l x b
6cm
A = 9 x 8
5cm
A = l x b
A = 72cm2
A = 6 x 5
A = 30cm2
19-Apr-17
Created by Mr. Lafferty Maths Dept.

31. Area of a Composite www.mathsrevision.com
MNU 2-11b
MNU2-11c
MTH 3-11b
Calculate the area of this shape
8cm
10cm
6cm
12cm
19-Apr-17

32. Area of a Composite www.mathsrevision.com
MNU 2-11b
MNU2-11c
MTH 3-11b
Calculate the area of this shape
Total Area =
10cm
= 104cm2
A = l x b
6cm
A = 8 x 10
A = l x b
A = 80cm2
A = 4 x 6
A =24cm2
4cm
8cm
19-Apr-17

33. Created by Mr. Lafferty Maths Dept.
Area of a Composite
MNU 2-11b
MNU2-11c
MTH 3-11b
Calculate the area of this shape
Rectangle 1
16cm
A = l x b
5cm
A = 16 x 5
A = 80cm2
5cm
Rectangle 2
A = l x b
Total Area
A = 6 x 5
6cm =
=110cm2
A = 30cm2
19-Apr-17
Created by Mr. Lafferty Maths Dept.

34. Now try Exercise 4 Ch10 (page 128)
Area of a Composite
MNU 2-11b
MNU2-11c
MTH 3-11b
Now try Exercise 4 Ch10 (page 128)
19-Apr-17
Created by Mr. Lafferty Maths Dept.

35. Created by Mr. Lafferty Maths Dept.
Starter Questions
Q1. Calculate
Q2. True or false the perimeter of the shape is 130cm
and the area is 46cm.
13cm
Q3.
10cm
Q4. Convert 57 metres to
(a) cm (b) mm
19-Apr-17
Created by Mr. Lafferty Maths Dept.

36. Area of A Right-Angled Triangle
Learning Intention
Success Criteria
Develop the formula for the area of any
right-angled triangle.
Remember the area formula for a right-angled triangle.
2. Use formula to work out area of triangle.
3. Show all working and units.
19-Apr-17
Created by Mr. Lafferty Maths Dept.

37. Area of A Right-Angled Triangle
MNU 2-11b
MNU2-11c
MTH 3-11b
Calculate the area of this shape
A = l x b
A = 10 x 8
8cm
A = 80cm2
10cm
19-Apr-17
Created by Mr. Lafferty Maths Dept.

38. Area of A Right-Angled Triangle
MNU 2-11b
MNU2-11c
MTH 3-11b
Vertical
Height
Demo
base
19-Apr-17
Created by Mr. Lafferty Maths Dept.

39. Area of A Right-Angled Triangle
MNU 2-11b
MNU2-11c
MTH 3-11b
Calculate the area of this shape
12cm
6cm
19-Apr-17
Created by Mr. Lafferty Maths Dept.

40. Area of A Right-Angled Triangle
MNU 2-11b
MNU2-11c
MTH 3-11b
Calculate the area of this shape
3cm
4cm
19-Apr-17
Created by Mr. Lafferty Maths Dept.

41. Area of A Right-Angled Triangle
MNU 2-11b
MNU2-11c
MTH 3-11b
Now try Exercise 6 Ch10 (page 129)
19-Apr-17
Created by Mr. Lafferty Maths Dept.

42. Length 4.5m = 9cm on the scale drawing Scale 1cm to 0.5m
For carpet grip we need to calculate PERIMETER 4m
Perimeter = = 21m
(8cm)
Number of 1 metre grips = 21
(3cm)
1.5m
No of packs = 21 ÷ 5 = 4.2 packs 2m
So we need 5 packs
(4cm)
4.5m
(9cm)
Cost = 5 x £ 4.50 = £22.50
(6cm) 3m
(12cm) 6m

43. Fitting carpet means we need to calculate AREA
Minimum Area required = = 24m2
Remember the
carpet only comes 4m wide ! 4m
4.5m 6m
1.5m 2m 3m
Area = L x B
= 4 x 4.5
= 18m2
6m2
What’s the best way to fit it ?

44. Minimum AREA required = 18 + 6 = 24m2
One possible solution 4m
4.5m 6m
1.5m 2m 3m
Area
4 x 6.5
= 26m2
Cost
£12 x 26
= £ 312 2m
Total cost £ £312 =
£334.50
With a bit left over !

45. Minimum AREA required = 18 + 6 = 24m2
Best possible solution 4m
Area
4 x 6
= 24m2
1.5m 2m
4.5m 3m
Cost
£12 x 24
= £ 288 6m
Total cost £ £288 =
£310.50
Nothing left over !