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Truth Tables and Electronic Circuits

Investigate circuits and record your findings in this simple introduction to truth tables and logic.

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Big and Small Numbers in Biology

Work with numbers big and small to estimate and calulate various quantities in biological contexts.

Big and Small Numbers in the Living World

Age 11 to 16 Challenge Level:
In estimation questions don't be afraid to have a go with a guess at some numbers in the problem and then to refine your estimate after checking it makes some sort of sense.

Although there is no 'right' answer to an estimation, there are good or bad estimations and sensible or over detailed calculations.

Think how you might make your estimation a good one, and think how it makes sense to ignore certain complexities in the calculation.