Why 7 is weird — Numberphile on the odd mathematical habits of seven.
Divisibility tricks — Numberphile on testing divisibility by hand — useful for decoding any number.
What is the Rule of 72? — The shortcut for how fast money, prices or users double.
Where the 72 in the Rule of 72 comes from — The logarithm behind the shortcut.
Double your money: the maths of the Rule of 72 — Worked examples at different growth rates.
How computers work: binary and data — How zeros and ones store numbers, text and images — the base layer of every AI model.
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