For Joshy: Top Ten+ Arithme”tricks”

Filed in PersonalTags: Education, Family, Geekery

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)