Which sequences of transformations performed on rhombus abcd shows its congruency to rhombus a'b'c'd?

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.