We look at the division of 30915102 by 921 
Let's see how many times 921 fits into 30915102.

Step 1:
If we divide 3 by 921, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 921

On to step 2:
921 goes into 30 0 times with a remainder of 30.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 30 and we're left with 30.
Grab the next digit (9) from the dividend, add it to 30, then carry on: 309 / 921

Let's proceed to step 3:
309 divided by 921 is 0 with a remainder of 309.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 309 and we're left with 309.
Append the next digit (1) from the dividend to 309 and continue with: 3091 / 921

Going ahead to step 4:
921 can be fit into 3091 3 times, resulting in a remainder of 328.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we subtract 2763 from 3091, we get 328.
Bring next digit (5) of the dividend behind the 328 and repeat the process: 3285 / 921

Advancing to step 5:
3285 divided by 921 is 3 with a remainder of 522.
Write down 3 as next digit of the result. 
Result so far: 33.0
Deduct 2763 from 3285 and we're left with 522.
Fetch the next digit (1) from the dividend, attach it to 522 and continue: 5221 / 921

Step 6:
The number 921 fits into 5221 5 times, leaving a remainder of 616.
Put 5 as the next digit of the answer. 
Result so far: 335.0
Subtracting 4605 from 5221 leaves us with 616.
Bring next digit (0) of the dividend behind the 616 and repeat the process: 6160 / 921

Step 7:
921 goes into 6160 6 times with a remainder of 634.
Put 6 as the next digit of the answer. 
Result so far: 3356.0
Deduct 5526 from 6160 and we're left with 634.
Take the next digit (2) from the dividend and append it to 634, then repeat: 6342 / 921

Step 8:
The number 921 fits into 6342 6 times, leaving a remainder of 816.
Use 6 as the next digit of our solution. 
Result so far: 33566.0
The remainder is 816 after subtracting 5526 from 6342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8160, and continue the process.

Advancing to step 9:
The number 921 fits into 8160 8 times, leaving a remainder of 792.
Use 8 as the next digit of our solution. 
Result so far: 33566.8
Subtracting 7368 from 8160 leaves us with 792.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7920, and continue the process.

Let's proceed to step 10:
921 goes into 7920 8 times with a remainder of 552.
Use 8 as the next digit of our solution. 
Result so far: 33566.88
Subtract 7368 from 7920 to get 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Our division results in 33566.88 with a remaining 0.552.