If we want to get $x$, we need to do the opposite of this equation. When you reverse the operation, you find $x$įurkan from TED Ankara Koleji in Turkey, Bernd and Qianwei from Humanitree and Shriya from International School Frankfurt in Germany showed what the computer does algebraically. Luigi from Humanitree and Karrthic from Australian International School Malaysia found an algebraic expression for the final number. $-$4 (opposite of $+$4) is 1, which was my original number. Kristin from Westridge School for Girls sent this explanation:Īll you have to do is do the problem backwards.įor example, if your number is 1 then you add 4, double that, subtract 7, and you will get 3.Īll the computer has to do is do the problem backwards. In Australia, John from Poolesville ES in the USA, Bracha and Antoine from St Philip's CofE Primary School Cambridge in the UK, Park from Renaissance International School Sigon in Korea, Diya from the UK, Deniz from North Leamington School in the UK, Ira from Coldspring3 and Adi from the New Beacon in the UK all described how the computer works out your starting number. Students from Westridge School for Girls in the USA, Cedric from Australian International School Malaysia, Poppy and Gracie from Walton High School in England, students from Humanitree in Mexico, Florence from Walthamstow Hall Junior School in the UK, Eric and Lucia from Willowbank School in New Zealand, Abdullah from Poland, students from Frederick Irwin Anglican School
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