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3x7
21
12/21 = 4/7 in its simplest form
You can divide 24/63 by 3 so it would simplify to 8/21.
21 and 35 are both divisible by 7 21/35 = 3/5
Yes and it is 2/3
18/21 = 6/7
no
21:6::7:2
1.0000666666
There is no need to simplify this, it is only a sum. 21 + (10/2) - 18 = 8
21 hours 99 minutes
6/21 = 2/7 simplified
5*root(21^2) = 5*21 = 105
16:21
3/7
4/7