In Comparing 2 underlined numbers which is 3, we need to find its place value In order to be able to find the difference of each given numbers.
First is 6300 => 6000 + 300 or may also say as 6 thousands + 3 hundreds
therefore the value of underlined number is hundreds
next, 530 => 500 + 30 or may also say as 5 hundreds + 3 tens.
Therefore, the value of underlined number tens.
Thus, the difference between the 2 underlined numbers is, the first given digit falls at hundreds place and the second is in tens place.