A fraction requires two numbers. 21 days as a fraction of what? A month, a year, a century?
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2.1 = 21/10
fisrt change 0.84 to 84/100. That is your fraction. Then it would simplify to 21/25. 21/25 is the answer
.42 is 42/100 or 21/50
21% is a fraction between 0 and 1. It cannot be converted to a whole number.
When you convert 21.4 into a fraction. The answer you get is 21 and 4/10, you reduce it down to 21 and 2/5. To turn it into a improper fraction, multiply the denominator by the whole number. Then add that number to the numerator.