A directory of useful objects found on the web for teaching Maths.

Browsing by The Australian Curriculum

Calculate the perimeter and area of rectangles using familiar metric units (ACMMG109)
* exploring efficient ways of calculating the perimeters of rectangles such as adding the length and width together and doubling the result
* exploring efficient ways of finding the areas of rectangles, such as recognising that counting the number of square centimetres in a grid gives the same result as multiplying the length and width