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bioNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of the biological sciences, designed to help develop the mathematics required to get the most from your study of biology at A-level and university.

Mixed up Mixture

Can you fill in the mixed up numbers in this dilution calculation?

Dilution Series Calculator

Which dilutions can you make using 10ml pipettes and 100ml measuring cylinders?

Packing 3D Shapes

Age 14 to 16
Challenge Level
Use your common sense and intuition as detailed calculations are exceedingly difficult and not really what the question is about.

Keep your eyes open for shapes in nature where 3D packing is exhibited

Once you are aware of 3D packing you will see that examples abound in nature. It is fascinating to ask: why does this packing of shapes occur?