Teaching and Group Activities for Understanding
Day 1 Teaching
Discuss colouring mats so that half is green and half is yellow. Stress that halves are equal. Give out paper circles, squares, semi-circles and equilateral triangles. Children fold them in half. Collect and show how each half is the same size as its opposite half.
Use the in-depth problem-solving investigation ‘Happy Halving’ from NRICH as today’s group activity.
Or, use these activities:
-- Find half of shapes in different ways, including folding.
Day 2 Teaching
Fold a piece of paper into quarters. Stress that quarters must all be the same size. One cannot be larger than the others as it wouldn’t be fair! Show how to shade different shapes in quarters.
-- Find a quarter of a set of illustrations by folding strips of paper.
-- Fold shapes to find a quarter.
Day 3 Teaching
Quickly revisit folding to give halves and quarters by modelling with a circle of paper. Next, show an example of a shape that can be folded in half one way, but not the other. Show an example of a shape that can not be folded in half.
-- Investigate halving and quartering shapes by folding.