Yes, it is. But you do not really need the decimal point after the 1.
7/21:= 7 ÷ 21= 0.333 in decimal
7 4/21 in decimal form is 7.190476 . . .
8 21/40 in decimal form is 8.525.
121 is already in the simplest form. It can be written as 0.047619 in decimal form (rounded to 6 decimal places).
3.5
21% in a decimal form is 0.21
7/21:= 7 ÷ 21= 0.333 in decimal
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.
8 21/40 in decimal form is 8.525.
7 4/21 in decimal form is 7.190476 . . .
121 is already in the simplest form. It can be written as 0.047619 in decimal form (rounded to 6 decimal places).
-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
3
21.012
1.05
0.913