Explore how to work out whether two variables are directly proportional with BBC Bitesize Maths. For students between the ages of 11 and 14. Work out whether quantities are inversely proportional, and ...
Two quantities are said to be in direct proportion if they increase or decrease in the same ratio. If two amounts are directly proportional we can scale the quantities up by multiplying. 150 ml × 5 = ...
Twenty secondary mathematics teachers described their thinking as they solved four proportion problems (Task 1), explained how they would teach two of the problems (Task 2), and solved four similar ...
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