Let's divide 63121087 by 915
The aim is to understand the frequency of 915 in 63121087.

On to step 1:
915 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 915

Step 2:
63 divided by 915 is 0 with a remainder of 63.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Append the next digit (1) from the dividend to 63 and continue with: 631 / 915

Let's proceed to step 3:
915 can be fit into 631 0 times, resulting in a remainder of 631.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 631 and we're left with 631.
Take the next digit (2) from the dividend and append it to 631, then repeat: 6312 / 915

Moving on to step 4:
6312 divided by 915 is 6 with a remainder of 822.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 822 after subtracting 5490 from 6312.
Grab the next digit (1) from the dividend, add it to 822, then carry on: 8221 / 915

Step 5:
When dividing 8221 by 915, we get 8 with a remainder of 901.
Record the quotient 8 as the next digit in the result. 
Result so far: 68.0
The remainder is 901 after subtracting 7320 from 8221.
Grab the next digit (0) from the dividend, add it to 901, then carry on: 9010 / 915

Step 6:
If we divide 9010 by 915, we get 9 and a remainder of 775.
Record the quotient 9 as the next digit in the result. 
Result so far: 689.0
If we take 8235 away from 9010, we end up with 775.
Include the next digit (8) from the dividend after 775, then repeat: 7758 / 915

Going ahead to step 7:
7758 divided by 915 is 8 with a remainder of 438.
Use 8 as the next digit of our solution. 
Result so far: 6898.0
The remainder is 438 after subtracting 7320 from 7758.
Include the next digit (7) from the dividend after 438, then repeat: 4387 / 915

Advancing to step 8:
When dividing 4387 by 915, we get 4 with a remainder of 727.
Use 4 as the next digit of our solution. 
Result so far: 68984.0
Subtract 3660 from 4387 to get 727.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7270, and continue the process.

Going ahead to step 9:
915 can be fit into 7270 7 times, resulting in a remainder of 865.
Write down 7 as next digit of the result. 
Result so far: 68984.7
If we take 6405 away from 7270, we end up with 865.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8650, and continue the process.

Advancing to step 10:
If we divide 8650 by 915, we get 9 and a remainder of 415.
Write down 9 as next digit of the result. 
Result so far: 68984.79
If we subtract 8235 from 8650, we get 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Moving on to step 11:
915 can be fit into 4150 4 times, resulting in a remainder of 490.
The number 4 becomes the next digit in our result. 
Result so far: 68984.794
If we subtract 3660 from 4150, we get 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Going ahead to step 12:
The number 915 fits into 4900 5 times, leaving a remainder of 325.
Put 5 as the next digit of the answer. 
Result so far: 68984.7945
If we take 4575 away from 4900, we end up with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

On to step 13:
3250 divided by 915 is 3 with a remainder of 505.
Record the quotient 3 as the next digit in the result. 
Result so far: 68984.79453
If we subtract 2745 from 3250, we get 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

Advancing to step 14:
When dividing 5050 by 915, we get 5 with a remainder of 475.
Put 5 as the next digit of the answer. 
Result so far: 68984.794535
If we take 4575 away from 5050, we end up with 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

On to step 15:
915 can be fit into 4750 5 times, resulting in a remainder of 175.
Write down 5 as next digit of the result. 
Result so far: 68984.7945355
If we take 4575 away from 4750, we end up with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

The final outcome is 68984.7945355, with a leftover of 1.75e-06.