Introduction to Ratio Monday, 15 April 2019

“There are twice as many boys as there are girls in this class” Ratio is a method is which we can compare two or more quantities. Example If a class of 30 pupils contained 20 boys and 10 girls, the we could say “There are twice as many boys as there are girls in this class” The same information can be written as a ratio Number of boys to girls = 2 to 1 {20 to 10 in its simplest form} The ratio 2 to 1 is usually written 2 : 1 Hence 20 : 10 is equivalent to 2 : 1 in its simplest form

Example Write each of the following ratios in their simplest form 9 : 6 40 : 10 15 : 35 10 : 15 16 : 24 21 : 9 8 : 14 50 : 80 45 : 63 24 : 36

Example Express the following ratios in their simplest form 12 : 3 5 : 25 £450 : £200 £20 : £15 2 hours : 15 minutes £3 : 50 pence 30 minutes : 1 hours

Example Burnley scored 32 goals this season. United scores 24 goals. What is the ratio of their scores, in its simplest form?

Example Adam has £35 spending money where as Brian has £20. What is the ratio of their spending money in its simplest form?

Example Michael, Ian and Tom are aged 12, 8 and 16 years of age, respectively. Write down the ratio of their ages.