Oh, dude, you want me to math? Alright, so 2.175 as a fraction is 2 and 175 thousandths. You can simplify it by dividing the top and bottom by 5 to get 2 and 35 hundredths. But like, who really needs fractions when you can just keep it as a decimal and call it a day, am I right?
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21.75 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 2175/100 which can be simplified, if required.
2175/34 is 63.9705882
2175 ÷ 5 = 435
0.2175/1, multiply top and bottom by 10000 (gets rid of decimal point) = 2175 / 10000, divide top and bottom by 25. > = 87 / 400 (simplest form of fraction)
2175 is a composite number because it has more than two factors