Ratio

Question 1

What is a ratio?

Answer 1

A way to express the relative sizes of two numbers.

Can be written as a fraction with the first number in the numerator and the second number in the denominator, in the form x to y, or in the form x:y.

Question 2

What is a proportion?

Answer 2

An equation relating two ratios

E.g. 12/3=8/2

Question 3

What is cross multiplication?

Answer 3

When the numerators of a proportion are multiplied by the opposite denominators.

E.g. X/y=z/w -> xw= zy