4/21 x 9/9 = 36/189
2/9 x 21/21 = 42/189
36/189 + 42/189 = 78/189 = 26/63
26/63
7 + 21 + 2 + 86 + 4 = 120
64 over 3 or 21 and 1 thrid
4/16 + 2/13 = 84/208 or 21/52
1/4 + 2/13 = 13/52 + 8/52 = 21/52
x/2 = 21 x = 42
sqrt(4) + 21 = 2 + 21 = 23
0.24163265306
4/16 + 2/13 = 21/52
2/3 - 4/7 = 14/21 - 12/21 = 2/21
80
4/16 + 2/13 in simplest terms = 21/52