**Ratio**– The ratio of two a & b is a/b & is denoted a:b where a & b are called the terms of the ratio.; the ist term a is called antecedent & the second term b is called consequence . ratio of two quontities is just a number & has no unit at all the comparison are made only between same kind of quantity.

**Comparison of ratio**– Express each of the ration in the simplest form of a friction find the LCM of the denominator of the fraction convert the denominator of each fraction equal to LCM and numerators according changes in denominator .

**Proportion** â€“ The proportion is a statement that two ratio are equal in other words it two ratio is equal we say that they are in proportion & use symbol: (to equal the two ratio)

e.g. a:b :: c:d