6,035 i have to find the value that underlined digit so the underlined digit is 3

To find the value of the underlined digit (in this case 3), you will be looking at its "spot." For example, 5 is in the ones spot, 3 in the tens spot, 0 in the hundreds spot, and 6 in the thousands spot. In each of these spots (starting right to left), you simply add one zero at the end. Since 5 is in the ones spot, there is no 0. Next, 3 will become 30, 0 will become 000 (although its value remains 0), and 6 will become 6000. So, the value of 3 is 30.