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Chapter 12 Class 6 Ratio and Proportion
Concept wise

Suppose I have two cats


So, Ratio of length of cat to baby cat = 20/10

= 2/1

= 2 : 1

So, cat is twice as long as baby cat


Now, let’s take

Finding ratio by changing units - Part 2

So, Ratio of length of the cat to the Lion = 20/2

= 10/1

= 10 : 1

So, cat is 10 times as long as Lion?



Here units are different

Cat’s length is in cm

Lion’s length is in m

So, we convert cm to m or cm

Finding ratio by changing units - Part 3


Cat’s length = 20 cm

Lion’s length = 2 m

     = 2 × 100 cm

     = 200 cm


So, Ratio of cat’s length to lion’s length = 20/200

 = 1/10

 = 1 : 10

So, Cat’s length is 1/10 th of lion’s

So, we have to keep in mind units when forming ratio

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.