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Three letters, one number, a knife and a stone bridge: How a graffitied equation changed mathematical history

On October 16, 1843, the Irish mathematician William Rowan Hamilton had an epiphany during a walk alongside Dublin's Royal Canal. He was so excited he took out his penknife and carved his discovery ...
BBC

Multiply a mixed number by an integer

You can multiply a mixed number by an integer using two different methods. You can convert the mixed number into an improper fraction. An improper fraction has a numerator greater than its denominator ...