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You can use Euclid's algorithm to calculate the gcf of two of the numbers - then use Euclid's algorithm again with the result and the third number.Or you can factor all the numbers into prime factors, and check which prime factors occur in all three numbers.
To have a type of abacus to use.
You can use the word feet by saying: My two feet are weary from walking seven miles today! or The lake is about 300,000 feet deep (or something like that for example).
When they learned how to use paper and some engineers developed a machine to make them work automatically.