AC9M2N03 Year 2 Mathematics

Content descriptor recognise and describe one-half as one of 2 equal parts of a whole and connect halves, quarters and eighths through repeated halving

Elaborations

• • Elaboration creating halves of a range of collections sets by sharing collections into 2 equal groups; for example, comparing half of a set of 12 washers with half of a set of 8 bolts to identify how they both represent one-half of their respective set
• • Elaboration creating halves using measurement attributes; for example, explaining that “a half is one part out of 2 equal parts of a whole”; equally folding a strip of paper, dividing a lump of playdough or separating a cup of water into 2 equal parts, then selecting one of the parts and naming it “one-half”; comparing half of a collection of 10 counters with half of a shape or object and explaining how each shows one-half of their respective wholes
• • Elaboration using repeated halving to subdivide shapes and objects in different ways to make corresponding halves, quarters and eighths; naming the parts and comparing the size of them to notice that they are all the same size, and demonstrating that a quarter is a half of a half and that an eighth is a half of a quarter
• • Elaboration dividing a shape into equal parts and relating the number of parts to the unit fraction; for example, if there are 4 equal parts then each part is a one-quarter and if there are 8 equal parts then each is one-eighth