Here's some instant fun for just about any time or place. All it requires is a pencil and a little spare change.
The skills it builds: coin values, addition, and subtraction
Take some coins from your pocket or purse, lay them out on a piece of paper, and have your child draw arms, legs, and other body parts to create a creature.
Then help her total up the value of the coins and write it beside the creature. Add or take away coins to form new shapes, and figure out the new sums.