Arithmetricks: More than 100 Amazing Math Tricks

By Jeri S. Cipriano. Ask a friend to pick a random number, add this, subtract that-and presto, astound your friend by guessing the new number! Math riddles, mental math tricks, magic squares, brain teasers, geometry puzzlers, amazing math facts, money math, calculator math, math competitions, and more fill this book of reproducible handouts with challenging, fun math-related problems. Grades 4–6. Answer key. Illustrated. 8½" x 11". Good Year. 156 pages. Second Edition. ©2007. GDY436.