We look at the division of 21307730 by 972 
Let's see how many times 972 fits into 21307730.

Moving on to step 1:
The number 972 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 972

On to step 2:
972 can be fit into 21 0 times, resulting in a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (3) from the dividend, add it to 21, then carry on: 213 / 972

Moving on to step 3:
213 divided by 972 is 0 with a remainder of 213.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 213 after subtracting 0 from 213.
Append the next digit (0) from the dividend to 213 and continue with: 2130 / 972

Step 4:
2130 divided by 972 is 2 with a remainder of 186.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 186 after subtracting 1944 from 2130.
Append the next digit (7) from the dividend to 186 and continue with: 1867 / 972

Moving on to step 5:
If we divide 1867 by 972, we get 1 and a remainder of 895.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
If we take 972 away from 1867, we end up with 895.
Fetch the next digit (7) from the dividend, attach it to 895 and continue: 8957 / 972

On to step 6:
The number 972 fits into 8957 9 times, leaving a remainder of 209.
Write down 9 as next digit of the result. 
Result so far: 219.0
Subtracting 8748 from 8957 leaves us with 209.
Bring next digit (3) of the dividend behind the 209 and repeat the process: 2093 / 972

On to step 7:
2093 divided by 972 is 2 with a remainder of 149.
The next digit of our result is 2. 
Result so far: 2192.0
If we take 1944 away from 2093, we end up with 149.
Append the next digit (0) from the dividend to 149 and continue with: 1490 / 972

On to step 8:
When dividing 1490 by 972, we get 1 with a remainder of 518.
The number 1 becomes the next digit in our result. 
Result so far: 21921.0
Subtracting 972 from 1490 leaves us with 518.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5180, and continue the process.

Advancing to step 9:
5180 divided by 972 is 5 with a remainder of 320.
Record the quotient 5 as the next digit in the result. 
Result so far: 21921.5
The remainder is 320 after subtracting 4860 from 5180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Moving on to step 10:
3200 divided by 972 is 3 with a remainder of 284.
Write down 3 as next digit of the result. 
Result so far: 21921.53
If we subtract 2916 from 3200, we get 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Let's proceed to step 11:
972 goes into 2840 2 times with a remainder of 896.
Write down 2 as next digit of the result. 
Result so far: 21921.532
The remainder is 896 after subtracting 1944 from 2840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8960, and continue the process.

Step 12:
8960 divided by 972 is 9 with a remainder of 212.
Put 9 as the next digit of the answer. 
Result so far: 21921.5329
The remainder is 212 after subtracting 8748 from 8960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

On to step 13:
972 can be fit into 2120 2 times, resulting in a remainder of 176.
Use 2 as the next digit of our solution. 
Result so far: 21921.53292
The remainder is 176 after subtracting 1944 from 2120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Advancing to step 14:
The number 972 fits into 1760 1 times, leaving a remainder of 788.
Record the quotient 1 as the next digit in the result. 
Result so far: 21921.532921
If we take 972 away from 1760, we end up with 788.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7880, and continue the process.

Moving on to step 15:
The number 972 fits into 7880 8 times, leaving a remainder of 104.
Write down 8 as next digit of the result. 
Result so far: 21921.5329218
If we take 7776 away from 7880, we end up with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Advancing to step 16:
When dividing 1040 by 972, we get 1 with a remainder of 68.
Write down 1 as next digit of the result. 
Result so far: 21921.53292181
Deduct 972 from 1040 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

The final outcome is 21921.53292181, with a leftover of 6.8e-08.