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In maths we learnt about three by three multiplication. Thsis is quite simple when you get the hang of it. For this example I am using 154 and 279. the first step is to take the bottom number and then times it by the top number then you need to do that for all the top numbers. The next step is to go to the middle bottom number and then do what you did just before. Next step is to do the same to the bottom left number. Now add it up and that is the answer. I got 42966 and I was correct!