Rate (change ÷ time)
AQA GCSE Biology calculation · part of the free Calculation Climb
A rate is how much something changes ÷ how long it took. In biology: oxygen bubbles per minute, water lost per hour, product made per second.
How to do it — step by step
- rate = change ÷ time.
- Watch the units asked for (per second, per minute, per hour…).
Worked example
A pondweed releases 60 bubbles in 2 minutes.
rate = 60 ÷ 2 = 30 bubbles per minute
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