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An Easy Way to Multiply by 10?
Age 7 to 11
Challenge Level 
If you click on 'Pause' in the interactivity, you can see some examples of other children's thinking, which might help you form your mathematical arguments.
Using some hands-on equipment might be helpful.
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In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?