536 Puzzles & Curious Problems

apples arithmetical arrange asked barrel cards circle clock Colonel Crackham colors column contain contiguous correct answer count counters course cross cube diagram digital roots digits sum distance divided divisible divisor dominoes dotted lines draw Dudeney Dudeney's Dump eight enclosed equal exactly example feet Figure five fold four pieces fractions give Greek cross half hexagon illustration shows inches leap length magic square Martin Gardner matches Mathematics miles an hour miles per hour minutes moves multiplied nine digits odd number penny pentagon perfect square Pigtown pips play player problem Professor Rackbrane PUZZLE Place rational triangles reader remainder route Sam Loyd score seven sheep side simple smallest number solution square number star steps straight line swastika trees triangle W. W. Rouse Ball walk wheel whole numbers yards