Improving Mental Arithmetic book?
Hey guys,
I'm ok with maths, have just finshed a computer science degree which involve alot of maths and whilst I have a calculator sitting next to me I'm fine. However my mental arithmetic is really quite poor, I don't know all of my multiplication tables and am generally not good at it! Can anyone recommend methods to improve it? anyone know of a good book to use? There are so many to choose from! Thanks.
Blinkz