# RATIO

RATIO
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Slide 1: Tekstslide
MathematicsUpper Secondary (Key Stage 4)GCSE

In deze les zitten 18 slides, met interactieve quizzen en tekstslides.

Lesduur is: 60 min

## Onderdelen in deze les

RATIO

#### Slide 1 -Tekstslide

What do you think a ratio is?

#### Slide 2 -Open vraag

A ratio is simply a comparison of 2 or more similar quantities
A ratio is simply a comparison of 2 or more similar quantities.

We use a colon :  to separate the numbers

#### Slide 3 -Tekstslide

In a Smarties pack, if there are 20 pink, 25 blue and 30 yellow Smarties, then the ratio of pink to blue to yellow is 20:25:30

The order is really important!

#### Slide 4 -Tekstslide

Can you think of any other ratios in everyday life?

#### Slide 6 -Tekstslide

There are 24 men and 8 women in an office. What is the ratio of women to men?

#### Slide 7 -Tekstslide

The ratio for diluting juice is 1 part juice to 8 parts water. How much water would I need for 200ml of juice?

#### Slide 8 -Tekstslide

A recipe uses a ratio of 4 parts flour to 2 parts sugar to 1 part margarine. How much sugar and margarine would I need for 800g of flour?

#### Slide 9 -Tekstslide

In a class there are 10 girls and 8 boys. What is the ratio of boys to girls in its simplified form?
A
10:8
B
8:10
C
4:5
D
5:4

#### Slide 10 -Quizvraag

A paint mixture uses 3 parts blue paint to 8 parts red paint. How much red paint would I need for 600ml of blue paint?
A
1000ml
B
800ml
C
2400ml
D
1600ml

#### Slide 11 -Quizvraag

A builder makes concrete using a ratio of 3 parts cement, 2 parts sand, 1 part water. How much sand would he need with 12kg of cement?
A
6kg
B
10kg
C
8kg
D
12kg

#### Slide 12 -Quizvraag

Dividing a quantity into a given ratio
You and your 3 friends have been running a lottery syndicate. You decide to share any winnings in the ratio 1:2:3:4 as some people have put more money in than others.
You win £10,000. How much does each person get?

#### Slide 13 -Tekstslide

Step 2:  Divide the amount by your parts to get the value of 1 part.

Step 3:  Multiply this back into the ratio

#### Slide 14 -Tekstslide

3 boys share £60 in the ratio 2 : 4 : 6
How much does each boy get?

#### Slide 15 -Tekstslide

The ratio of iphones to android phones sold in the UK is 3:1. If there are 16 million phones sold each year, How many iphones are sold?
A
10 million
B
12 million
C
8 million
D
4 million

#### Slide 16 -Quizvraag

Jack drinks a bottle of diluted juice. The bottle is 500ml. If the ratio of juice to water is 1 : 4 how much water is in his bottle?
A
400ml
B
100ml
C
200ml
D
300ml

#### Slide 17 -Quizvraag

How do you feel about ratios after our lesson?
😒🙁😐🙂😃