The line in a fraction can be read as "divided by." 3/4 = 3 divided by 4 = 0.75
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You turn a fraction into a decimal by dividing the top number by the bottom. And you turn a decimal into a percent by multiplying the decimal by 100.
A number expressed in decimal form usually is a fraction. It is simply a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, since it is a decimal fraction, there is not another simpler decimal form.
The decimal form of a fraction is either a terminating or recurring decimal.
2.915 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. And, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is 2915/1000. You can simplify this rational fraction if you so wish.
-0.312 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. And, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is -312/1000 which simplifies to -39/125.