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Sucker, Joshua. (2020). Coins in Twoland. In S. Kohli (Ed.), Math Circle Activity Database. American Institute of Mathematics. https://mathcircles.org/activity/coins-in-twoland/

Coins in Twoland

Contributor(s):
Math Circles:
In Twoland, the only money is coins with value 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, and so on. How many ways can change be given, following Twoland’s strict rules? In this whimsical session, participants will practice precision and organizational skills. This session is also suitable for student math circles and the classroom.

Activity Guide

This guide includes a set of problems as well as notes for teachers.