Ratio and proportion for GCSE

Main PowerPoint covers all aspects of ratio and proportion for GCSE (but not direct and inverse proportion):

• relationship between fractions and ratios
• dividing an amount in a ratio - inc finding the total amount and solving problems from the difference between two shares
• simplifying ratios by converting units
• expressing as 1:n
• working with map scales
• proportion and recipes
• best buys
• expressing a ratio in algebraic form
• latest version includes a few harder questions involving fractions of fractions, combining pairs of ratios, and change of ratio, with worked examples for each.

Includes handout versions of main question pages (i.e. black & white with no answers included) at end of presentation.

Also a second PowerPoint with starter/homework questions, most pages including answers (but again with handout versions at the end). Updated April 2020 with a correction and a few minor changes.