Try these 5 Minute brain workout exercises - an easy one first, then a harder one.
Taken from my book 'The 5 Minute Brain Workout' available from Amazon
The answers are here
5 MINUTE LIFE ENRICHERS blog
What can you do in 5 minutes? Quite a lot actually; from small steps through to significant changes, simply by using 5 minutes of your time effectively. Here you'll find ways to enrich your life, 5 minutes at a time. The posts fall into 12 categories