Daily Mail 30 Sec Challenge Volume II

Ever wish you were better at mental arithmetic? Young or old, everyone can sharpen their mental maths and rejuvenate their grey matter with these incredibly simple but effective puzzles straight from the desk of the original and best 30 Second Challenge maths master. Compelling, fun and suitable for all ages and abilities, this is the ultimate brain-training tool for people on the go.

Norman D. Lock had worked as a teacher, head teacher and lecturer in Mathematics Education at the University of Reading. He currently works as a teacher, and editor and a freelance consultant in Mathematics Education.