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To convert the decimal 21.45 to a fraction, one could write 2145/100 or 21 and 45/100, after reducing, this would become 429/20 or 21 and 9/20.
To reduce one would have to determine the lowest common denominator. In this case, both 45 and 100 are evenly divisible by 5 but no greater number, yielding the lowest common denominator of 20.
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