Math teacher Ben Orlin writes and draws the (aptly named) blog Math With Drawings and is the author of a new book, Math for English Majors: A Human Take on the Universal Language. To mark its ...
This leaflet gives tables, formulae and rules for users of the CURTA calculating machine. Received with CURTA calculator 1982.0922.01. overall: .3 cm x 7.7 cm x 15.1 cm; 1/8 in x 3 1/32 in x 5 15/16 ...
You must take two steps to get from a given number to make 10. Each step must change the number by adding, subtracting, multiplying by or dividing by a number from 1 to 9. (Multiplying or dividing by ...
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