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6 and 13/100
6 and 13/20
A number is divisible by 13 if it is a multiple of 13. In other words, 13 times a number results in a big number that is divisible by 13.
13 is not an unlucky number it is superstitious. I love the number 13
Nothing goes into 13 evenly other than 1 and 13, so that means it is a prime number.