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Ratio's and fractions

Good Afternoon!
Schedule: 
  • Learning goals 
  • Opening problem
  • Ratios
  • Ratios and fractions
  • Class work
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Slide 1: Diapositive
WiskundeMiddelbare schoolvwoLeerjaar 2

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Good Afternoon!
Schedule: 
  • Learning goals 
  • Opening problem
  • Ratios
  • Ratios and fractions
  • Class work

Slide 1 - Diapositive

Learning goals 
At the end of this lessons I can:
  • Write two quantities as a ratio
  • Write a ratio of quantities as a fraction 
  • Write fractions of a quantities as a ratio

Slide 2 - Diapositive

Opening problem
Think, pair, share!

Slide 3 - Diapositive

Write as a ratio:
9 mm is to 5 mm

Slide 4 - Question ouverte

Write as a ratio:
I need 500 g of carrot for every 1k g of potatoes in 'Hutspot'

Slide 5 - Question ouverte

A bag contains apples and bananas. The ratio of apples to bananas is 3:4.
What fraction of the bag is bananas?

Slide 6 - Question ouverte

What to do
If you: 
- Got all of them right                Quietly work on the work on ManageBac
- Got 1 mistake                              Join the explanation and get to work after
- Got more than 1 mistake       Join the explanation and some examples

Slide 7 - Diapositive

Ratio's 
A Ratio is an ordered comparison of quantities of the same kind



Slide 8 - Diapositive

Ratio's 
A Ratio is an ordered comparison of quantities of the same kind

9 mm is to 5 mm                                                                                       3:5

                                                                   

Slide 9 - Diapositive

Ratio's 
A Ratio is an ordered comparison of quantities of the same kind

9 mm is to 5 mm                                                                                       9:5

7 minutes is to 2 hours       

                                                                           

Slide 10 - Diapositive

Ratio's 
A Ratio is an ordered comparison of quantities of the same kind

9 mm is to 5 mm                                                                                       9:5

7 minutes is to 2 hours          7 minutes is to 120 minutes      

                                                                           

Slide 11 - Diapositive

Ratio's 
A Ratio is an ordered comparison of quantities of the same kind

9 mm is to 5 mm                                                                                       9:5

7 minutes is to 2 hours          7 minutes is to 120 minutes      7:120

                                                                      

Slide 12 - Diapositive

Ratio's 
A Ratio is an ordered comparison of quantities of the same kind

9 mm is to 5 mm                                                                                       9:5

7 minutes is to 2 hours          7 minutes is to 120 minutes      7:120

500 g is to 1 kg                                                                                  

Slide 13 - Diapositive

Ratio's and fractions
When going from a ratio to a fraction, FIRST find your total amount of parts 

Ex. To mix a certain drink I need 4 parts of water and 1 part of lemonade. 
What fraction of the drink is lemonade? 

What fraction of the drink is water?

Slide 14 - Diapositive

Ratio's and fractions
When going from a ratio to a fraction, FIRST find your total amount of parts 

Ex. To mix a certain drink I need 4 parts of water and 1 part of lemonade. 
What fraction of the drink is lemonade? 


What fraction of the drink is water?
​5​​1​​
​5​​4​​

Slide 15 - Diapositive

Ratios and fractions
A bag contain A bag contains apples and bananas. The ratio of apples to bananas is 3:4.
What fraction of the bag is bananas?

Slide 16 - Diapositive

Ratios and fractions
A bag contain A bag contains apples and bananas. The ratio of apples to bananas is 3:4.
What fraction of the bag is bananas?

Of the fruit in the bag is bananas
​7​​4​​

Slide 17 - Diapositive

Ratios and fractions
When going from fractions to ratios: 
I have many stickers, 9/15 are animal stickers, 4/15 are flower stickers and 1/15 are other stickers.

Find the ratio of animal stickers to flower stickers:                               
 Find the ratio of Flower stickers to other sticker:                                  
   Find the ratio of animal stickers to other stickers:                                 

Slide 18 - Diapositive

Class work 
(if you only got 1 mistake in the beginning, start on this work by yourself) 

p. 311                        16A: 3bdfh, 4abcde
P. 312-313               16B: 1, 2, 3, 5, 7

Finished? "Ratios challenging word problems" ManageBac

Slide 19 - Diapositive

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