Expressed as a mixed number in its simplest form, 6 3/7 - 20/21 = 5 10/21 or five and ten twenty-firsts.
1.
21 over 25 is 84%
It is 21/10 minus 1/10 = 20/10 or 2
0.84 which is also 84%
No. A factored form of one can not be used here.
-21.. (or minus 21)
Yes. 15/21 = 5/7. 5/7 is in simplest form.
21 minus 0.5 is 20.5
63 minus 21 is 42.
Right now, it is 2013, so if you are 20 years old, you were born in 1992 or 1993. In general, if a person is 20 years old, that means that they were born in the year (this year minus 20) or (this year minus 21).
It is 21 minus 100 = -79
21 minus -5 is 26.