21 in decimal form can be 21.0 or 21.00 or 21.000, or however many zeros
you'd like to write after the decimal point.
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-0.84 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 -84/100 which simplifies to -21/25.
21/1000 equals 0.021
2.1 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 21/10 which cannot be simplified.
To express 10.5 as a fraction in simplest form, we first need to convert the decimal to a fraction. Since 10.5 is equivalent to 10 1/2, we can write it as 21/2 in fraction form. To simplify this fraction, we find the greatest common divisor of 21 and 2, which is 1. Therefore, 10.5 as a fraction in simplest form is 21/2.
It is: 21/100 = 0.21 as a decimal