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Fooled by a Sign

How percentages can deceive and mislead us

Do you remember learning about fractions at school? You had only just kind of mastered working with whole numbers, when they got broken up, and the intuitive rules simply didn’t work anymore. Why on earth was 1/3 + 1/4 not equal to 1/7? How could 1/2 of 1/3 be 1/6?