Illustrate the steps, each time on a number line, where you will explain to a Grade 6 class how numbers can be negative and positive.
Use the case of Mpho who has R5 and she buys a packet of chips for R8 at the tuck shop. The next day she brings R10 to the tuck-shop and buys a lolly for R2. Show how her money goes up and down and where she ends up.
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