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        | All rational and irrational numbers |  
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        | Numbers that can be written as a ratio of two integers |  
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        | Non-repeating, non-terminating decimals; can't be written as a ratio of two integers (ex: pi, square roots) |  
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        | (...-3, -2, -1, 0, 1, 2, 3...) |  
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        | Equation for perimeter of triangle, square, rectangle and circle |  
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        | p=a+b+c, p=4s, p=2l + 2w, c=2(pi)r or c=(pi)d |  
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        2, 3, 5, 7, 11, 13, 17, 19,  23, 29,  31, 37,  41, 43, 47,  53, 59,  61, 67, 71, 73, 79,  83, 89,  97 |  
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