13931087 divided by 850 
The aim is to understand the frequency of 850 in 13931087.

Moving on to step 1:
1 divided by 850 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 850

Advancing to step 2:
850 can be fit into 13 0 times, resulting in a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Fetch the next digit (9) from the dividend, attach it to 13 and continue: 139 / 850

Going ahead to step 3:
The number 850 fits into 139 0 times, leaving a remainder of 139.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 139 leaves us with 139.
Fetch the next digit (3) from the dividend, attach it to 139 and continue: 1393 / 850

Advancing to step 4:
850 can be fit into 1393 1 times, resulting in a remainder of 543.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 543 after subtracting 850 from 1393.
Take the next digit (1) from the dividend and append it to 543, then repeat: 5431 / 850

Advancing to step 5:
If we divide 5431 by 850, we get 6 and a remainder of 331.
Use 6 as the next digit of our solution. 
Result so far: 16.0
The remainder is 331 after subtracting 5100 from 5431.
Append the next digit (0) from the dividend to 331 and continue with: 3310 / 850

Step 6:
If we divide 3310 by 850, we get 3 and a remainder of 760.
The next digit of our result is 3. 
Result so far: 163.0
Deduct 2550 from 3310 and we're left with 760.
Bring next digit (8) of the dividend behind the 760 and repeat the process: 7608 / 850

On to step 7:
850 goes into 7608 8 times with a remainder of 808.
The number 8 becomes the next digit in our result. 
Result so far: 1638.0
Subtract 6800 from 7608 to get 808.
Take the next digit (7) from the dividend and append it to 808, then repeat: 8087 / 850

Moving on to step 8:
When dividing 8087 by 850, we get 9 with a remainder of 437.
Write down 9 as next digit of the result. 
Result so far: 16389.0
If we subtract 7650 from 8087, we get 437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4370, and continue the process.

Let's proceed to step 9:
If we divide 4370 by 850, we get 5 and a remainder of 120.
Write down 5 as next digit of the result. 
Result so far: 16389.5
If we subtract 4250 from 4370, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 10:
1200 divided by 850 is 1 with a remainder of 350.
Record the quotient 1 as the next digit in the result. 
Result so far: 16389.51
If we subtract 850 from 1200, we get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Advancing to step 11:
The number 850 fits into 3500 4 times, leaving a remainder of 100.
Record the quotient 4 as the next digit in the result. 
Result so far: 16389.514
Subtracting 3400 from 3500 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Moving on to step 12:
1000 divided by 850 is 1 with a remainder of 150.
Write down 1 as next digit of the result. 
Result so far: 16389.5141
Deduct 850 from 1000 and we're left with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Going ahead to step 13:
1500 divided by 850 is 1 with a remainder of 650.
The next digit of our result is 1. 
Result so far: 16389.51411
Subtract 850 from 1500 to get 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6500, and continue the process.

The final result is 16389.51411 with a remainder of 0.00065.