You either multiply or divide both the numerator (top number) and the denominator (bottom number) by the same number.
For example, 2/4: Both numbers can be divided evenly by 2; 2 divided by 2 equals 1, 4 divided by 2 equals 2, so 2/4 can be 'reduced' to 1/2, which is an 'equivalent fraction'.
Now look at 7/8: You can multiply both numbers by any number you wish, so long as it is the same number for both; 7 times 3equals 21, 8 times 3 equals 24, so an equivalent fraction for 7/8 is 21/24.
Reducing a fraction to lowest terms is simply finding an equivalent fraction in which the numerator and denominator can no longer both be divided by the same number evenly.
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0.8333333333333333 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 8333333333333333/10000000000000000. This rational fraction cannot be simplified.
0.293333333 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 293333333/1000000000.
3.0007 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 30007/10000. You cannot simplify this fraction.
18.9 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 189/10.
12.023 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 12023/1000.