### Mathematics Class VI

Knowing Our Numbers
Whole Numbers
Playing With Numbers
Basic Geometrical Ideas
Fractions
Integers
Decimals
Data Handling
Mensuration
Algebra
Ratio and Proportion
Practical Geometry
Symmetry

# Ratio and Proportion

We represent the term ratio with the symbol ‘:’. Ratio is when we compare two different quantities. For two quantities to be compared they need to have the same unit. Otherwise, it is not possible to compare the two different quantities.

To say that two different quantities are in proportion, it means that the quantities are equal and therefore, they can be equated easily. We can represent proportion with the symbol ‘=’.

If two ratios are not equal, then we say that they are not in proportion. In a statement of proportion, the four quantities involved when taken in order are known as respective terms. First and fourth terms are known as extreme terms. Second and third terms are known as middle terms.

In these types of sums, it is always needed to know the unitary method and apply it to solve the sums easily. In order to use unitary method, we need to find the value for one unit at first. Then we need to equate the quantity for one commodity to find the quantity for the number of commodities given in the question.

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