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The Gelosia Method of Long Multiplication


This challenge is about problem solving, trial and error and flexible thinking.

Take a look at this method of multiplying two digit numbers together. It comes from Italy and is over 500 years old.

Can you figure out how this way of multilpication works by looking at the completed example?

You will need to estimate your answer first. You are allowed to use a calculator to complete this challenge if you wish.

Please explain how you solved this problem in your learning log.

Remember – be methodical and use trial and error. Persevere and be flexible in your thinking –  if you try hard enough,  I am sure you will eventually come to a solution in your own way.  The actual calculations are not that hard! 
















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