An icosihenagon is a 21 sided polygon. Learn to make it using thread and nails on a wooden board.
Paper cutting and pasting demonstration for the angle sum property of a triangle
A paper cutting pasting activity instructions for visualising the area of a circle formula
Learn to multiply 2 two digit numbers in a single step
Learn how to find the square of a number ending with 5.
This is a short cut technique to multiply numbers nearing 100