Ratio & Miscellaneous

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Ratio

• Ratio is involved when comparing

different quantities• Ratio is given as

‘parts’• e.g. mixing paints

Ratio

• Paint is mixed • 600ml red to 400ml

blue• This is written as• Red:blue =

600ml:400ml• They have the same

units so we can cancel• 600ml:400ml =

600:400

Simplifying ratios

• Like fractions we can simplify by dividing by the same number

• 600:400 can both be divided by 100

• 600:400 = 6:4• 6:4 can both be

divided by 2• 6:4 = 3:2

Simplifying ratios

• MUST MAKE SURE ALL PARTS HAVE THE SAME UNITS

• Simplify 150cm:6m• 150cm:6m

=150cm:600cm• = 150:600• = 15:60• = 3:10

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