Class 6 Maths Ratio And Proportion Ratio


In certain situations, comparison by division makes better sense than comparison by taking the difference. The comparison by division is known as the Ratio. Firstly, It is important to remember that for comparison, the two quantities must be in the same unit. If they are not in the same unit, they should be expressed in the same unit before the ratio is taken. Secondly, the ratio in which quantities are taken is also important. For e.g. when the price of diary is Rs.30 and the price of notebook is Rs.10, we get the following:

Price of a Diary/ Price of a Notebook = 30/10 = 3/1

Price of a Notebook/ Price of a Diary = 10/30 = 1/3

Note that the ratio 3:1 is different from 1: 3. Thus, the order in which quantities are taken to express their ratio is important.

Another important property of ratio is we can get equivalent ratios by multiplying or dividing the numerator and denominator by the same number.

6: 4 =   6/4 = 6*2/4*2 = 12/8

Therefore, 12: 8 is an equivalent ratio of 6: 4.

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