MATH

Today we studied RATIOS & PROPORTIONS

A RATIO - a comparison of two numbers

e.g.  2:5           o r 2:5  or 


A proportion is a name we give to a statement that two ratios are equal. It can be written in two ways:

• two equal fractions,

or,


• using a colon,    a:b = c:d

When two ratios are equal, then the cross products of the ratios are equal.
That is, for the proportion, a:b = c:d ,  a x d = b x c