420
8
2
5
11
20
Use each of the numbers only once with any mathematical operations to make an expression equal to the target.
If you can't make the target exactly, how close can you get to it?
Topics: Starter  Arithmetic  Mental Methods
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Previous Day  This starter is for 2 November  Next Day
20(2 + 5)(11  8) = 420
How many different sulutions do you think there are?
What strategies did you use?
Did you use your head, paper or a calculator?
Or did you use all three?
Could a computer help solve this problem?
Would you improve if you practised solving problems like this?
How could a group of students efficiently work together on a problem like his?
Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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