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Understanding Ratio

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by

Mr Mattock

on 22 September 2017

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Transcript of Understanding Ratio

Writing and Simplifying Ratio
Starter
Simplifying Ratio
L.O. - To write ratio and simplify ratio.
Main Activity 2
Red
Amber
Green
Examples
Simplify:

15 : 25

60 : 72

12 : 16 : 28
Main Activity 2 Answers
Red
Amber
Green
Red: (1) 16 children (2) 7 adults

Amber (3) 30 children (4) 10 children.

Green (5) 12 children (24 in first nursery,
36 in the second).
Dice of Ultimate Power

1) Give a key word for the lesson.
2) Summarise one key point for the
lesson.
3) Explain one thing you have learned this
lesson.
4) State one thing you still don't understand following this lesson.
5) Suggest one thing you would like to find out
based on this lesson.
6) Free choice from 1 to 5, or another you make
up.
Simplifying Ratio
Examples
Simplify:

15 : 25
3:5

60 cm : 7.2 m
1:12

12 : 16 : 28
3:4:7
For each picture, write: (a) the fraction shaded
(b) the fraction not shaded
Starter
For each picture, write: (a) the fraction shaded
(b) the fraction not shaded
3 5
8 8
7 3
10 10
Starter
For each picture, write: (a) the fraction shaded
(b) the fraction not shaded
3 5
8 8
7 3
10 10
What is the ratio of shaded to unshaded in each picture?
Starter
For each picture, write: (a) the fraction shaded
(b) the fraction not shaded
3 5
8 8
7 3
10 10
What is the ratio of shaded to unshaded in each picture?
3:5

7:3
Writing Ratio
What is the ratio of
the distance across
to the distance up?
Writing Ratio
What is the ratio of
the distance across
to the distance up?
2:1
Writing Ratio
Write the ratio of the
shaded to unshaded parts
Write the ratio of the distances across to up.
Writing Ratio
Write the ratio of the
shaded to unshaded parts
Write the ratio of the distances across to up.
2:6
3:2
11:13
10:17
9:7
18:46
4:3
3:7
3:1
5:1
4:3
2:1
4:2
6:3
How does this
diagram show that
all 3 ratios are
equivalent?
Simplifying Ratio
2:1
4:2
6:3
How does this
diagram show that
all 3 ratios are
equivalent?
Which ratio simplifications do these
diagrams show?
Simplifying Ratio
Which ratio simplifications do these
diagrams show?
2:6 = 1:3
10:2 = 5:1
4:8 = 3:6 = 2:4 = 1:2
Key
Examples

Activities
Activity
Answers

Worked
Example

Worked
Example

Worked
Example

Worked
Example

Worked
Example
Full transcript