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By ones By twos By fours By eights By tens By twenties By fourty (if you want to count that one)
It is only because we count in tens - and 5 10 and 2 are factors.
There are not more tens. The cardinality ("count") of the set of tens is exactly the same as the cardinality of the set of hundreds. The mapping f(x) = 10x where x is a multiple of 10 is bijective. Consequently, its domain and range are of the same "size". The words "count" and "size" are in quotation marks because the relevant values are infinite.
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