We're dividing 86278643 by 861 
The aim is to understand the frequency of 861 in 86278643.

Moving on to step 1:
If we divide 8 by 861, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 861

Let's proceed to step 2:
When dividing 86 by 861, we get 0 with a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Take the next digit (2) from the dividend and append it to 86, then repeat: 862 / 861

Let's proceed to step 3:
861 can be fit into 862 1 times, resulting in a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 861 from 862 and we're left with 1.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 861

Going ahead to step 4:
The number 861 fits into 17 0 times, leaving a remainder of 17.
The next digit of our result is 0. 
Result so far: 10.0
Subtract 0 from 17 to get 17.
Grab the next digit (8) from the dividend, add it to 17, then carry on: 178 / 861

Moving on to step 5:
The number 861 fits into 178 0 times, leaving a remainder of 178.
Record the quotient 0 as the next digit in the result. 
Result so far: 100.0
If we take 0 away from 178, we end up with 178.
Grab the next digit (6) from the dividend, add it to 178, then carry on: 1786 / 861

On to step 6:
If we divide 1786 by 861, we get 2 and a remainder of 64.
The next digit of our result is 2. 
Result so far: 1002.0
If we subtract 1722 from 1786, we get 64.
Bring next digit (4) of the dividend behind the 64 and repeat the process: 644 / 861

Step 7:
861 can be fit into 644 0 times, resulting in a remainder of 644.
Record the quotient 0 as the next digit in the result. 
Result so far: 10020.0
If we take 0 away from 644, we end up with 644.
Grab the next digit (3) from the dividend, add it to 644, then carry on: 6443 / 861

Advancing to step 8:
The number 861 fits into 6443 7 times, leaving a remainder of 416.
The next digit of our result is 7. 
Result so far: 100207.0
Subtracting 6027 from 6443 leaves us with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Going ahead to step 9:
When dividing 4160 by 861, we get 4 with a remainder of 716.
Put 4 as the next digit of the answer. 
Result so far: 100207.4
If we take 3444 away from 4160, we end up with 716.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7160, and continue the process.

Moving on to step 10:
861 can be fit into 7160 8 times, resulting in a remainder of 272.
Write down 8 as next digit of the result. 
Result so far: 100207.48
Subtracting 6888 from 7160 leaves us with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Let's proceed to step 11:
The number 861 fits into 2720 3 times, leaving a remainder of 137.
Put 3 as the next digit of the answer. 
Result so far: 100207.483
The remainder is 137 after subtracting 2583 from 2720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Step 12:
If we divide 1370 by 861, we get 1 and a remainder of 509.
The number 1 becomes the next digit in our result. 
Result so far: 100207.4831
If we subtract 861 from 1370, we get 509.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5090, and continue the process.

Going ahead to step 13:
861 goes into 5090 5 times with a remainder of 785.
The next digit of our result is 5. 
Result so far: 100207.48315
Deduct 4305 from 5090 and we're left with 785.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7850, and continue the process.

Let's proceed to step 14:
861 can be fit into 7850 9 times, resulting in a remainder of 101.
Record the quotient 9 as the next digit in the result. 
Result so far: 100207.483159
The remainder is 101 after subtracting 7749 from 7850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Advancing to step 15:
861 goes into 1010 1 times with a remainder of 149.
Use 1 as the next digit of our solution. 
Result so far: 100207.4831591
The remainder is 149 after subtracting 861 from 1010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Moving on to step 16:
861 can be fit into 1490 1 times, resulting in a remainder of 629.
Write down 1 as next digit of the result. 
Result so far: 100207.48315911
If we subtract 861 from 1490, we get 629.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6290, and continue the process.

The quotient of the division is 100207.48315911, and the remainder is 6.29e-07.