Learning objectives
Simplify ratios, write them in the form 1 : n and divide a quantity in a given ratio
Solve direct proportion problems in context, including recipes, map scales and best-value comparisons
Use rates such as average speed, density and population density, and convert between units of rate
Read clocks and timetables in 12-hour and 24-hour notation and calculate elapsed time
Set up and use algebraic formulae for direct and inverse proportion, including squares, cubes and roots (Extended)
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