A Maths Dictionary for Kids

This is an online interactive dictionary of math terms for math topics.  It has animated definitions, examples, activities and a calculator. Also available as an iPhone/iPad app called Maths Charts.

Note that this dictionary uses Australian English spelling so some words will be spelling a little differently from American English (maths for math, colour for color, metre for meter). Jenny Eather provides charters, posters, and classroom displays for teachers.