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ExcerptStudent Information Page: Make a List This strategy is easy to use and helps you to "think straight". Sometimes a problem does not involve any real calculating, but there is just too much information for you to handle in your head – so, you write it down. Making a list means you can think about each part in turn without worrying that you will forget the parts that came before. Let’s say you wanted to buy a birthday present for your friend and your Mom said you could buy one box of Lego® and one toy car. When you went to the toy shop, you found 5 different Lego® sets and 4 different toy cars to choose from. How many different ways could you make a present of a toy car and a Lego® set? It would be very hard to try and think of all the ways you could do it without writing them down. But there is nothing difficult to actually work out. You only have to make sure you haven’t missed any items out. Here’s how the "Make a List" strategy helps. You need to find a system to write down all the possible ways you can do it and stay "in the rules". The rule this time is to have one Lego® set and one toy car. Start by listing all the Lego® sets and toy cars separately: Now start with the first Lego set and match it to each toy car in turn:
Now do the same for the next Lego® set: Bob the Builder with: Porsche, Mercedes, Chrysler, Ford. Total = 4. You should be able to see that for each one of the Lego® sets, there will be 4 different ways you could make the present.You know there are 5 different Lego® sets, so there will be 5 lots of 4. Altogether, there are 20 different ways you could make a present from the toys at that shop. Can you work out how many there would be if you found another different Lego® set? Related eBooks
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