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Number Tracks
Age 7 to 11
Challenge Level 
A good look should give you at least two different patterns for the sums of the pairs of numbers.
In what multiplication tables are the numbers you get from adding the $3$ strips and the $5$ strips?
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Suppose we allow ourselves to use three numbers less than 10 and multiply them together. How many different products can you find? How do you know you've got them all?
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