For Joshy (and the rest of us, too): I’m sure you’re working on your math tables, memorizing addition, subtraction, multiplication, and division of numbers from one through ten.
Do you need a shortcut for multiplying by four, five, nine, or eleven, or squaring two-digit numbers ending in five? How about subtracting a large number from 1,000? Well then, see this list of arithme[em]tricks[/em].
(H/T: Lifehacker)















Comment on September 22, 2007 at 11 AM
Chip, Josh really likes the first tip. We are going to slowly work through the list of other tips so he doesn’t become overwhelmed! This is a pretty cool list!