Page 36 - Demo

Lesson 16: Grobby partitions a set of 8 into 3 partsThrough appropriately playful learning experiences, children should be able to recognise and understand what happens when quantities (sets) are partitioned and combined.TasksLearning outcomes%u2022 We are learning to break 8 up into 3 parts or 3 sets%u2022 We are learning to combine various combinations of 3 sets of bricks to make a total of 8MaterialsA set of 8 bricks, 3 lids from tins, 2 large cut-out %u2018+%u2019 signs, 1 equals sign %u2018=%u2019 and the task sheet.ProcedureGather all the children together on the floor. Set down the 3 lids and the 2 %u2018+%u2019 signs between them.Set down 8 bricks above the lids. Ask the children: What have I got on the floor? This should elicit something akin to the following: We have 3 lids, 8 bricks and 2 %u2018adding signs%u2019 or%u2019 plus signs%u2019 and an %u2018equals or makes sign%u2019.Place the three lids approximately 15cm apart. Ask a child to take some of the bricks and place them on the first lid e.g. 2. Ask another child to place some on the second lid (1). Ask a third child to place the remaining brick(s) on the third lid. (5) How many bricks had we to start with? (8) Have we still got 8? Yes. How are the 8 now arranged? There are 2 bricks on the first lid, 1 brick on the second lid and 5 bricks on the third lid, how many is that altogether?To find how many altogether, we must add/combine them together. We use the %u2018+%u2019 to show that we are adding them together. Place a %u2018+%u2019 between the first and second lid, and another %u2018+%u2019 sign between the second and third lid.How can we be sure that 2 bricks %u2018+%u2019 1 brick %u2018+%u2019 5 bricks, make 8 bricks altogether? We combine and recount. Recombine, recount and record the answer as 2+1+5=8.With this approach, you are helping to make the abstract a little more immediate and tangible. We overlay the whole process with language and talk the children through it, helping to build out their understanding of the concept.Now place the 8 bricks once again outside the lids and find other ways to separate and then combine the bricks to make 8. Record all the ways as you go, on a large sheet of paper or on the whiteboard.Be sure to cover the %u20180%u2019 set too i.e. 5 bricks on first lid, 3 bricks on second lid and %u20180%u2019 bricks left for the third lid. Discuss and record (5+3+0=8).The children, in pairs are tasked to find and record some of the many ways to partition and make 8 using 3 sets. %u00a034