Relationship between ratio and division: the former term of ratio is equivalent to dividend, the latter term is equivalent to divisor and the ratio is equivalent to quotient.

Relationship between ratio and fraction: the former term of ratio is equivalent to numerator, the latter term is equivalent to denominator, and the ratio is equivalent to fractional value.

The basic nature of the ratio: the first and last items of the ratio are multiplied or divided by the same number at the same time (except 0), and the ratio remains unchanged.

24:36=(24÷ 12):(36÷ 12)=2:3

0.75: 1=75: 100=3:4

3/4:9/ 10=(3/4×20):(9/ 10×20)= 15: 18=5:6