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First note that 4.2 = 4.2/1; then multiply both numerator and denominator of this fraction by 10 to yield 42/10. This can be reduced to lower terms by dividing both numerator and denominator by 2 to yield 21/5. Since the integral factors of 21 are 7 and 3 while 5 is itself a Prime number, 21/5 can not be further reduced and is the answer sought.

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Q: How do you turn 4.2 in to a fraction?
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