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Ratios and Percents (ratio (word problems (organise info (describe using…
Ratios and Percents
ratio
relative size of stuff
notations
colon
e.g 2:3
fraction
e.g \(\frac{2}{3}\)
word problems
organise info
describe using ratios
sometimes easier to think of a part to whole
use ones that have the quantity that you are trying to find
pay attention to what the ratio is about
conversion factors
multiply
Percents
per 100
% symbol
multiply percent with number
if x is increased by k% then \(x+\frac{k}{100}\)
if x is decreased by k% then \(x-\frac{k}{100}\)
easily converted to decimals
multiply consecutive percents
problems
6.55