No it is not.
No.
All multiples of 520, which is an infinite number.
Yes, 520 / 2 = 260
Yes, the result is 130.
520
10 percent of 520 is 52.
2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260.
There are 10 millimetres in one centimetre. Therefore, 520 millimetres is equal to 520/10 = 52 centimetres.
30% of 520 = 156= 30%/100% * 520= 3/10 * 520= 0.3 * 520= 156
520
520 is DXX500 + 10 + 10 = DXX