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Many results can be explained by applying GCSE algebraic techniques, and many can also be explained using diagrams or pictorial representations.
Number theory is studied in more detail at university, and it is often seen as one of the "purest" forms of mathematics. Gauss said "Mathematics is the queen of the sciences - and number theory is the queen of mathematics".
You can watch a recording of the webinar in which we discussed the mathematical thinking which can be prompted by these problems.
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Always perfect
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Common divisor
Can you find out what numbers divide these expressions? Can you prove that they are always divisors?
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Polite numbers
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Digital equation
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Seeing is believing
We are very grateful to the Heilbronn Institute for Mathematical Research for their generous support for the development of these resources.