Aba-Conundrums Abacus & Mathematical Puzzles: Mathematical puzzles based on the abacus Fascinating mind challenging activity Builds proficiency in logic & deductive reasoning Provides practice with place value computation fractions prime numbers 120 puzzling Aba-Conundrums ordered from easy to most difficult High quality wooden abacus with sliding wooden beads Brilliantly painted red yellow and blue components Highly durable write-on/ wipe-off puzzle book Reproducible information included for classroom use (Make copies of abacus template & laminate provide seeds or buttons ) Solutions provided Fully safety tested