4.15 = 4 + 15/100
The 15 is in the hundreds place, so you can divide it by 100.
4 + 15/100 = 4 + 3/20
Simplify the 15/100 to make finding a common denominator easier.
4 + 3/20 = 80/20 + 3/20
Find a common denominator (20) and multiply 4 by 20.
80/20 + 3/20 = 83/20
You have your answer.
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How do convert -12.405 into a fraction
To convert an improper fraction, you divide the numerator by the denominator. Hope this helps!
You can convert any whole number to a fraction by putting it over one.
Convert 8.014 into a fraction
Presumably, if you have a fraction it already is in "fractional notation". There is really nothing to convert.