RATIO

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

Cette leçon contient 18 diapositives, avec quiz interactifs et diapositives de texte.

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RATIO

Slide 1 - Diapositive

What do you think a ratio is?

Slide 2 - Question ouverte

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 - Diapositive

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 - Diapositive

Can you think of any other ratios in everyday life?

Slide 5 - Question ouverte

Slide 6 - Diapositive

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

Can we simplify our answer?

Slide 7 - Diapositive

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 - Diapositive

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 - Diapositive

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 - Quiz

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 - Quiz

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 - Quiz

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 - Diapositive

Step 1:   Add your parts together.

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 - Diapositive

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

Slide 15 - Diapositive

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 - Quiz

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 - Quiz

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

Slide 18 - Sondage