Maths - Doubling

This week in Maths we will be looking at doubling and halving. How quickly can you double a number? Have a look at these links to remind you!
For the first game, can you keep doubling the number of donuts?

http://pbskids.org/cyberchase/games/doubling/index.html

http://www.ictgames.com/rhoodbeyond10.html