67.8 as a fraction is 67 8/10. in simplest form it is 67 4/5.
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Expressed as a vulgar fraction, 0.678 is equal to 678/1000. Reduced to a fraction in its lowest terms, by dividing both the numerator and denominator of the fraction by 2, this is equal to 339/500, or three hundred and thirty-nine five hundredths.
First find the length of the repeating section of numbers. eg. For 0.678678678, 678 is the repeating section, and it's length is three. Divide this repeating section by the number with that many nines - for example in this case 678/999 = the fraction. Another example - 0.554755475547 = 5547/9999
5000-678 = 4322
The factors of 678 are 1, 2, 3, 6, 113, 226, 339, and 678.
234 + 678 = 912