Any repeating decimal digits (this includes repetition after a certain point, e.g. 2.4510101010...) is a rational number.
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Well, honey, let me break it down for you. 3.45 is a rational number because it can be expressed as a simple fraction, 345/100. So, yes, it's rational, unlike some of the decisions I've seen people make in my 99 years on this planet.
21,000/345 = 60.87 60.87 x 345 = 21000
345 is an odd number. This is because odd numbers don't divide by 2 exactly, but even numbers do divide by 2 exactly. 345 divided by 2 is 172.5 which is not a whole number. Therefore 345 is an odd number.
987 - 345 = 642
60 less than 345 = 345 - 60 = 285