Stay sharp with these popular quickfire number puzzles.

The idea is simple – start with the number on the top, then tackle each mathematical instruction in turn, keeping a running total to reach a final answer. Can you do it in your head? Can you do it in 30 seconds? Can you avoid the temptation to reach for your calculator?

Product Information:
• ISBN: 9781912708871
• Author: Puzzler Media Limited
• Publisher: Puzzler Media Limited
• Format: Paperback