A collection of math challenges, using readily-available materials. It shows how to guess someone's age with just three simple questions, total up any five shopping items faster than a calculator, create a paper tetrahedron, perform card tricks and illusions, and create a floating sphere.
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A collection of math challenges, using readily-available materials. It shows how to guess someone's age with just three simple questions, total up any five shopping items faster than a calculator, create a paper tetrahedron, perform card tricks and illusions, and create a floating sphere.
Read Less
Add this copy of Mental Math Challenges to cart. $5.08, very good condition, Sold by ThriftBooks-Reno rated 5.0 out of 5 stars, ships from Reno, NV, UNITED STATES, published 1999 by Sterling.
Add this copy of Mental Math Challenges to cart. $45.87, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Hialeah, FL, UNITED STATES, published 1999 by Sterling.
