39558037 ÷ 815 
The aim is to understand the frequency of 815 in 39558037.

Step 1:
The number 815 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 815

Moving on to step 2:
When dividing 39 by 815, we get 0 with a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Take the next digit (5) from the dividend and append it to 39, then repeat: 395 / 815

Advancing to step 3:
815 can be fit into 395 0 times, resulting in a remainder of 395.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 395, we end up with 395.
Include the next digit (5) from the dividend after 395, then repeat: 3955 / 815

On to step 4:
The number 815 fits into 3955 4 times, leaving a remainder of 695.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 3260 from 3955 to get 695.
Append the next digit (8) from the dividend to 695 and continue with: 6958 / 815

Advancing to step 5:
When dividing 6958 by 815, we get 8 with a remainder of 438.
Use 8 as the next digit of our solution. 
Result so far: 48.0
Subtracting 6520 from 6958 leaves us with 438.
Include the next digit (0) from the dividend after 438, then repeat: 4380 / 815

On to step 6:
815 goes into 4380 5 times with a remainder of 305.
Put 5 as the next digit of the answer. 
Result so far: 485.0
If we subtract 4075 from 4380, we get 305.
Grab the next digit (3) from the dividend, add it to 305, then carry on: 3053 / 815

Advancing to step 7:
3053 divided by 815 is 3 with a remainder of 608.
Put 3 as the next digit of the answer. 
Result so far: 4853.0
If we take 2445 away from 3053, we end up with 608.
Take the next digit (7) from the dividend and append it to 608, then repeat: 6087 / 815

Going ahead to step 8:
If we divide 6087 by 815, we get 7 and a remainder of 382.
The next digit of our result is 7. 
Result so far: 48537.0
Subtracting 5705 from 6087 leaves us with 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

On to step 9:
The number 815 fits into 3820 4 times, leaving a remainder of 560.
The number 4 becomes the next digit in our result. 
Result so far: 48537.4
Deduct 3260 from 3820 and we're left with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Advancing to step 10:
815 goes into 5600 6 times with a remainder of 710.
Use 6 as the next digit of our solution. 
Result so far: 48537.46
If we take 4890 away from 5600, we end up with 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

On to step 11:
7100 divided by 815 is 8 with a remainder of 580.
Write down 8 as next digit of the result. 
Result so far: 48537.468
Deduct 6520 from 7100 and we're left with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Moving on to step 12:
If we divide 5800 by 815, we get 7 and a remainder of 95.
Put 7 as the next digit of the answer. 
Result so far: 48537.4687
If we subtract 5705 from 5800, we get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Going ahead to step 13:
815 can be fit into 950 1 times, resulting in a remainder of 135.
Put 1 as the next digit of the answer. 
Result so far: 48537.46871
Subtracting 815 from 950 leaves us with 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

On to step 14:
815 goes into 1350 1 times with a remainder of 535.
Write down 1 as next digit of the result. 
Result so far: 48537.468711
Subtract 815 from 1350 to get 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

Our division results in 48537.468711 with a remaining 5.35e-05.