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Biology makes good use of numbers both small and large. Try these questions involving big and small numbers. You might need to use standard biological data not given in the question. Of course, as these questions involve estimation there are no definitive 'correct' answers. Just try to make your answers to each part as accurate as seems appropriate in the context of question.
Extension: Try to improve your estimates by giving a range of numbers between which you know the true answer lies.
How do you write a computer program that creates the illusion of stretching elastic bands between pegs of a Geoboard? The answer contains some surprising mathematics.
Learn about the link between logical arguments and electronic circuits. Investigate the logical connectives by making and testing your own circuits and fill in the blanks in truth tables to record your findings.
Investigate circuits and record your findings in this simple introduction to truth tables and logic.