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This algorithm works the way we learned how to do multiplication in 3rd grade, but using a super carry as opposed to a one digit carry. So instead of multiplying each digit of the first number by each digit of the second number, we multiply each digit of the first number by the entire second number. This resuls in a "super carry", a carry that could be greater than a two digit number. It took me a long while to get this though - if written in C or a language that doesn't support more than 64 bit multiplication - this question should be marked as hard.
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Extra Long Factorials
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This algorithm works the way we learned how to do multiplication in 3rd grade, but using a super carry as opposed to a one digit carry. So instead of multiplying each digit of the first number by each digit of the second number, we multiply each digit of the first number by the entire second number. This resuls in a "super carry", a carry that could be greater than a two digit number. It took me a long while to get this though - if written in C or a language that doesn't support more than 64 bit multiplication - this question should be marked as hard.