Ratio and rates

A ratio compares two amounts: two cups of flour for every cup of sugar, one centimetre on the map for every kilometre on the ground. A rate compares amounts of different things, such as kilometres and hours. Together they let you scale a recipe, read a map, compare prices and describe anything that grows or shrinks.

Step	Page	You will be able to
Play	Recipes, sharing and "for every"	Make more of a recipe that tastes the same and share things fairly by groups
Explore	Ratios, unit rates and scale	Write and simplify ratios, share in a ratio, find the best buy and use a map scale
Build	Proportional reasoning and speed	Solve proportions, spot direct and inverse proportion and work with speed, distance and time
Master	Percent	Find percents of amounts, percent change, reverse percents and repeated changes
Beyond	Growth and decay	Use compound interest, the number \(e\), half-lives and doubling times