Flag ratio activity

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

Good morning!

Schedule: 

• Learning goals 
• Last time
• Flag activity

Learning goals 

At the end of this lessons I can:

• Use ratio's to solve real life problems

What did we do last time?

Intro question

Which mixture would be the sweetest? mix 1: 50 ml of water with 1 tsp of sugar; mix 2: 100 ml of water with 3 tsp of sugar; or mix 3: 200 ml of water with 5 tsp of sugar.

(1 min) BY YOURSELF

Intro question

Which mixture would be the sweetest? mix 1: 50 ml of water with 1 tsp of sugar; mix 2: 100 ml of water with 3 tsp of sugar; or mix 3: 200 ml of water with 5 tsp of sugar.

(1 min) discuss which mixture you would choose as a group

Which mixture would be the sweetest? mix 1: 50 ml of water with 1 tsp of sugar; mix 2: 100 ml of water with 3 tsp of sugar; or mix 3: 200 ml of water with 5 tsp of sugar.

1. Mix 1
2. Mix 2
3. Mix 3

Intro question

Which mixture would be the sweetest? 50 ml of water with 1 tsp of sugar; 100 ml of water with 3 tsp of sugar; or 200 ml of water with 5 tsp of sugar.

50 : 1 = 

100 : 3 = 

200 : 5

Ratio

A ratio is a comparison of two values expressed as a quotient.

Ratio

A ratio is a comparison of two values expressed as a quotient.

Ratio

A ratio is a comparison of two values expressed as a quotient.

Example:

if a class has 12 girls and 18 boys, the ratio of girls to boys is 12/18.

Ratio

A ratio is a comparison of two values expressed as a quotient.

Example:

if a class has 12 girls and 18 boys, the ratio of girls to boys is 12/18.

 equivalent fraction 2/3

Ratio

A ratio is a comparison of two values expressed as a quotient.

Example:

if a class has 12 girls and 18 boys, the ratio of girls to boys is 12/18.

 equivalent fraction 2/3

the ratio between girls and boys= 2:3

Examples

What is the ratio orange to yellow to boom candy?

Examples

What is the ratio orange to yellow to boom candy?

12 : 8 : 1

Examples

What is the ratio orange to yellow ?

Examples

What is the ratio orange to yellow ?

12 : 8 

Examples

What is the ratio orange to yellow?

12 : 8 

Can I simplify this ratio?

Examples

What is the ratio orange to yellow?

12 : 8 

Can I simplify this ratio?

Examples

What is the ratio orange to yellow?

12 : 8 

Can I simplify this ratio?

3 : 2

MP2A

MP2F

Flag activity 

Go to P. 319 and read until exercise 1. 

Complete 1 in your duo.  (5 min) 

Flag activity 

Go to P. 319 and read until exercise 1. 

Compare answers in group (5 min) 

Flag activity 

90 cm 

180 cm 

60 cm 

60 cm 

60 cm 

1. 

a) Length = 180 cm

b) Width of stripe = 60 cm  

Flag activity 

Complete question 2 in your duo 15-20 min

40 cm

2. a) 2 : 3 = 40 : 60

b) 2 : 3 = x : y 

 total: 5 parts 

Green stripe: 40 x 24 cm

Yellow/Red stripe: 20 x 36 cm

c) Green Area = 960 cm2

Yellow/red Area = 720 cm2

Total area = 40 x 60 = 2400 cm2

d) green:                    40%

Yellow/red :                     30 %   

60 cm

x = 24 cm

y= 36 cm

of 40 cm = 20 cm

​2​​1​​

​2400​​960​​⋅100=

​2400​​720​​⋅100=

2 cm

d) green:                    40%

Yellow/red :                     30 %   

e) Are these percentages true for all Beninese flags? 

f) 2 x 3 cm

3 cm

1 cm

​2400​​960​​⋅100=

​2400​​720​​⋅100=

1 cm

More flags! 

Very Challenging questions about ratio's in the US flag... 

Find on ManageBac. 

\

Tarsia puzzle

(who can solve it the fastest?) 

it needs to be this shape: 

Tarsia puzzle

(who can solve it the fastest?) 

it needs to be this shape: 

Test discussion 

1. Read through your investigation and the feedback/comments. 

2. Look at the checks and x's in the descriptors. Does this make sense with the feedback/comments. 

3. Fill in the reflection form and put it in your portfolio. 

4. After 10 min you can ask me questions based on the descriptors. 

No more questions? 

5. Is your Investigation and reflection form in your portfolio (With cover on top? Write the task on the cover page. 

6. Continue the flag activity.