This requires an algorithm: students are taught to stack one number atop another and multiply each digit of the bottom number ...
I Universidade de São Paulo, Av. do Trab. São Carlense, 400, CP 668, São Carlos, Brazil. E-mail: [email protected] II CIRRELT and HEC Montréal, Montréal H3T 2A7, Canada. E-mails: ...
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