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== Long multiplication ==
If a [[numeral system|positional numeral system]] is used, a natural way of multiplying numbers is taught in schools
as '''long multiplication''', sometimes called '''grade-school multiplication''', sometimes called '''Standard Algorithm''':
multiply the [[wikt:multiplicand|multiplicand]] by each digit of the [[wikt:multiplier|multiplier]] and then add up all the properly shifted results. It requires memorization of the [[multiplication table]] for single digits.
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