# Introducing concept of Ratio

Lubna Naseem
40mins
Critical thinking, Problem Solving
Remember, Understand, Application
No Objective 1: With this activity students will be able understand the quantitative relation between two amounts showing the number of times one value contains or is contained within the other.Objective 2: They will be able to think critically and co relate the concept with other examples and situations which are given in the book and real life by connecting it back to this activity
Ratio is an important aspect of life.It used to compare part with part within a set of objects. Its about comparing size of quantities within a set of Objects.
Scale, pencil, paper & rubber, desk or note book/ mathematics book
Activity to be done in pairs. This is to save time and also enabling children to work in groups

Step 1: Before we introduce the concept of ratio to the class, students should be asked to measure the length of the scale/ ruler they have in their pencil box. They should make a note down the measurements in centimeters.

Step 2: Students should be asked to measure the length of their desks/tables on which they write. They should note down the measurements for the same in centimeters.

Step 3: Now students should be asked simple questions like- how many times of their scale is the desk? b’coz scale is 1 unit here and the number of times scale was used to measure the desk was for example 3 then Desk is 3 times the size of scale
Or scale is 1 third the size of desk.
Now this can be written either as 1/3 or 1:3

Step 4: Give the example of Indian flag- the height to width ratio of the Indian Flag is 2:3
So for every 2 (inches, meters, whatever) of height there should be 3 of width.
If we made the flag 20 inches high, it should be 30 inches wide. If we made the flag 40 cm high, it should be 60 cm wide (which is still in the ratio 2:3)

Exercise: Ask them to draw the flag using 2:3 ratio n class in cms.

http://www.commoncoresheets.com/Math/Ratios/Finding%20Ratios%20Visual/English/1.pdf Reference Videos: https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates/pre-algebra-ratios-intro/v/ratios-intro http://www.commoncoresheets.com/Math/Ratios/Ratio%20Wording/English/2.pdf http://www.commoncoresheets.com/Math/Ratios/Finding%20Ratios% 20-%20Numbers/English/5.pdf http://www.commoncoresheets.com/Math/Ratios/Finding%20Ratios%20-%20Mix%20(Word)/English/4.pdf
1. Ability to solve simple questions on ratio which will be given to them after this activity is over both verbally and by writing.
2. in the second session, problem sums can be introduced and other situation based questions can be given which will help the teacher understand students understanding capacity.
Accurate, Complete, Knowledgeable, Methodical

The interest will be generated because children will be measuring by themselves and will be learning from their peers regarding simple length measurements. And whenever children are working together or are given a hands on activity they are always excited because they are getting to express their ideas on it simultaneously.