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Grace Church School’s ABACUS International Math Challenge is open to any child, anywhere in each of three age groups (see details and rules below). Science and math teacher, Tivadar Divéki posts eight problems a month in each age group. Students are asked not only to solve the problems but also to present the reasoning in their solutions.
http://www.gcschool.org/pages/program/Abacus.html
saved under Online Maths Puzzle Contests
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