We're dividing 53993236 by 861 
The aim is to understand the frequency of 861 in 53993236.

Advancing to step 1:
When dividing 5 by 861, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 861

Moving on to step 2:
When dividing 53 by 861, we get 0 with a remainder of 53.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Take the next digit (9) from the dividend and append it to 53, then repeat: 539 / 861

On to step 3:
If we divide 539 by 861, we get 0 and a remainder of 539.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 539, we get 539.
Append the next digit (9) from the dividend to 539 and continue with: 5399 / 861

Step 4:
The number 861 fits into 5399 6 times, leaving a remainder of 233.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 233 after subtracting 5166 from 5399.
Bring next digit (3) of the dividend behind the 233 and repeat the process: 2333 / 861

Let's proceed to step 5:
861 can be fit into 2333 2 times, resulting in a remainder of 611.
The number 2 becomes the next digit in our result. 
Result so far: 62.0
Subtract 1722 from 2333 to get 611.
Take the next digit (2) from the dividend and append it to 611, then repeat: 6112 / 861

Advancing to step 6:
861 goes into 6112 7 times with a remainder of 85.
Use 7 as the next digit of our solution. 
Result so far: 627.0
If we subtract 6027 from 6112, we get 85.
Take the next digit (3) from the dividend and append it to 85, then repeat: 853 / 861

Going ahead to step 7:
861 goes into 853 0 times with a remainder of 853.
Record the quotient 0 as the next digit in the result. 
Result so far: 6270.0
If we take 0 away from 853, we end up with 853.
Grab the next digit (6) from the dividend, add it to 853, then carry on: 8536 / 861

Advancing to step 8:
When dividing 8536 by 861, we get 9 with a remainder of 787.
Put 9 as the next digit of the answer. 
Result so far: 62709.0
Subtracting 7749 from 8536 leaves us with 787.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7870, and continue the process.

Moving on to step 9:
If we divide 7870 by 861, we get 9 and a remainder of 121.
The next digit of our result is 9. 
Result so far: 62709.9
Deduct 7749 from 7870 and we're left with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Advancing to step 10:
The number 861 fits into 1210 1 times, leaving a remainder of 349.
Write down 1 as next digit of the result. 
Result so far: 62709.91
Subtract 861 from 1210 to get 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Advancing to step 11:
If we divide 3490 by 861, we get 4 and a remainder of 46.
The number 4 becomes the next digit in our result. 
Result so far: 62709.914
If we take 3444 away from 3490, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 12:
861 can be fit into 460 0 times, resulting in a remainder of 460.
Write down 0 as next digit of the result. 
Result so far: 62709.914
Subtract 0 from 460 to get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

On to step 13:
When dividing 4600 by 861, we get 5 with a remainder of 295.
The number 5 becomes the next digit in our result. 
Result so far: 62709.91405
If we subtract 4305 from 4600, we get 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

On to step 14:
The number 861 fits into 2950 3 times, leaving a remainder of 367.
Record the quotient 3 as the next digit in the result. 
Result so far: 62709.914053
Deduct 2583 from 2950 and we're left with 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

On to step 15:
If we divide 3670 by 861, we get 4 and a remainder of 226.
The number 4 becomes the next digit in our result. 
Result so far: 62709.9140534
Subtracting 3444 from 3670 leaves us with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Going ahead to step 16:
When dividing 2260 by 861, we get 2 with a remainder of 538.
Record the quotient 2 as the next digit in the result. 
Result so far: 62709.91405342
If we take 1722 away from 2260, we end up with 538.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5380, and continue the process.

After the division, we end up with 62709.91405342 and a remainder of 5.38e-07.