# Class 6 Chapter 12 Ratio and Proportion Math Formulas

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Ratio:-

A ratio is a mathematical expression of comparing two quantities by division.

It is written using ‘:’

For Example:- 5: 2.

Note: – The unit must be same to compare two quantities

Equivalent Ratios:-

If we multiply or divide both the numerator and denominator to the same number then we find the equivalent ratio.

For example:- , ,

The Lowest form of the Ratio:-

If there is no common factor of numerator and denominator except one then it is the lowest form of the ratio.

For eg –  , , etc.

Proportion:-

When we say that two ratios are equal then it is called Proportion.

=

It is written as a:b::b:c
Unitary Method:-

If we find the value of one unit then calculate the value of the required number of units this  is called the Unitary method.

For example:-

If the cost of 4 books is 320 Rs. then what will be the cost of 8 books?

Cost of 3 books = Rs. 320

Cost of 1 book = = Rs. 80

Cost of 6 books =  = Rs. 640