51380020 ÷ 921 
We want to figure out the number of times 51380020 can be divided by 921.

Let's proceed to step 1:
921 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 921

Advancing to step 2:
The number 921 fits into 51 0 times, leaving a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Append the next digit (3) from the dividend to 51 and continue with: 513 / 921

Let's proceed to step 3:
If we divide 513 by 921, we get 0 and a remainder of 513.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 513 after subtracting 0 from 513.
Bring next digit (8) of the dividend behind the 513 and repeat the process: 5138 / 921

On to step 4:
921 goes into 5138 5 times with a remainder of 533.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 4605 away from 5138, we end up with 533.
Fetch the next digit (0) from the dividend, attach it to 533 and continue: 5330 / 921

Advancing to step 5:
5330 divided by 921 is 5 with a remainder of 725.
Use 5 as the next digit of our solution. 
Result so far: 55.0
If we subtract 4605 from 5330, we get 725.
Append the next digit (0) from the dividend to 725 and continue with: 7250 / 921

Let's proceed to step 6:
If we divide 7250 by 921, we get 7 and a remainder of 803.
Put 7 as the next digit of the answer. 
Result so far: 557.0
Deduct 6447 from 7250 and we're left with 803.
Bring next digit (2) of the dividend behind the 803 and repeat the process: 8032 / 921

Advancing to step 7:
921 goes into 8032 8 times with a remainder of 664.
Use 8 as the next digit of our solution. 
Result so far: 5578.0
If we take 7368 away from 8032, we end up with 664.
Include the next digit (0) from the dividend after 664, then repeat: 6640 / 921

On to step 8:
6640 divided by 921 is 7 with a remainder of 193.
The next digit of our result is 7. 
Result so far: 55787.0
The remainder is 193 after subtracting 6447 from 6640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Going ahead to step 9:
921 goes into 1930 2 times with a remainder of 88.
Use 2 as the next digit of our solution. 
Result so far: 55787.2
If we subtract 1842 from 1930, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Let's proceed to step 10:
When dividing 880 by 921, we get 0 with a remainder of 880.
Use 0 as the next digit of our solution. 
Result so far: 55787.2
If we take 0 away from 880, we end up with 880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8800, and continue the process.

On to step 11:
921 goes into 8800 9 times with a remainder of 511.
Put 9 as the next digit of the answer. 
Result so far: 55787.209
If we subtract 8289 from 8800, we get 511.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5110, and continue the process.

On to step 12:
5110 divided by 921 is 5 with a remainder of 505.
The next digit of our result is 5. 
Result so far: 55787.2095
If we subtract 4605 from 5110, we get 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

Step 13:
If we divide 5050 by 921, we get 5 and a remainder of 445.
The number 5 becomes the next digit in our result. 
Result so far: 55787.20955
Subtract 4605 from 5050 to get 445.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

The quotient of the division is 55787.20955, and the remainder is 0.000445.