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Teaching Mental Maths From Level Five: Measures and Mensuration in Geometry
This booklet from the National Strategies describes teaching approaches that can be used to develop mental mathematics abilities beyond National Curriculum level five. The activities described in this supplement build upon and develop activities suggested in Teaching mental mathematics from level five: geometry.
It includes activities that focus on comparative measures. These can be a stimulus to geometrical thinking. Observing lengths or angles that appear to be equal in size and trying to establish whether they are necessarily equal or not necessarily equal is the basis for deriving properties of lines, angles and shapes, including congruence and similarity.
Access to software, such as dynamic geometry packages, enables students to more easily establish conjectures about equality of measures.
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