The thing that worries most non-specialists teaching language is pronouncing words correctly from a book. This is where Forvo is priceless. Native speaker users and the site itself have uploaded audio clips of word for us non native speakers to copy. The site has 250+ languages uploaded. I tested the Mandarin section, as I understand that, and it was faultless. An amazing resource.
A fun and useful area and perimeter 2D shape tutorial and interactive activities for your whiteboard. Learn how to find the area and perimeter of rectangles and triangles and then complete the questions.