Question

the value of 3 in 6,300 is what times the value of 3 in 530

Answer 1

10 times as much.  The three in 6300 represents 300, and the 3 in 530 represents 30.  300 is ten times 30, so the value of the 3 in 6300 is ten times as much the value of the 3 in the 530.