Suppose I have two cats

7.jpg

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

8.jpg

So, Ratio of length of Lion = 20/2

= 10/1

= 10 : 1

So, cat is 10 times as long as Lion?

WRONG

 

Here units are different

Cat’s length is in cm

Lion’s length is in m

So, we convert cm to m or cm

9.jpg

So,

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

  1. Chapter 12 Class 6 Ratio And Proportion
  2. Concept wise

About the Author

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.