We divide 91015297 by 639
The aim is to understand the frequency of 639 in 91015297.

Moving on to step 1:
639 can be fit into 9 0 times, resulting in a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 639

On to step 2:
The number 639 fits into 91 0 times, leaving a remainder of 91.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 91, we get 91.
Take the next digit (0) from the dividend and append it to 91, then repeat: 910 / 639

Let's proceed to step 3:
If we divide 910 by 639, we get 1 and a remainder of 271.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 639 from 910 and we're left with 271.
Grab the next digit (1) from the dividend, add it to 271, then carry on: 2711 / 639

Moving on to step 4:
639 can be fit into 2711 4 times, resulting in a remainder of 155.
The next digit of our result is 4. 
Result so far: 14.0
If we take 2556 away from 2711, we end up with 155.
Fetch the next digit (5) from the dividend, attach it to 155 and continue: 1555 / 639

Advancing to step 5:
639 can be fit into 1555 2 times, resulting in a remainder of 277.
Write down 2 as next digit of the result. 
Result so far: 142.0
Subtract 1278 from 1555 to get 277.
Grab the next digit (2) from the dividend, add it to 277, then carry on: 2772 / 639

Advancing to step 6:
If we divide 2772 by 639, we get 4 and a remainder of 216.
Record the quotient 4 as the next digit in the result. 
Result so far: 1424.0
If we subtract 2556 from 2772, we get 216.
Include the next digit (9) from the dividend after 216, then repeat: 2169 / 639

On to step 7:
2169 divided by 639 is 3 with a remainder of 252.
Put 3 as the next digit of the answer. 
Result so far: 14243.0
The remainder is 252 after subtracting 1917 from 2169.
Grab the next digit (7) from the dividend, add it to 252, then carry on: 2527 / 639

On to step 8:
639 can be fit into 2527 3 times, resulting in a remainder of 610.
Put 3 as the next digit of the answer. 
Result so far: 142433.0
Deduct 1917 from 2527 and we're left with 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Step 9:
639 goes into 6100 9 times with a remainder of 349.
Use 9 as the next digit of our solution. 
Result so far: 142433.9
Deduct 5751 from 6100 and we're left with 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Moving on to step 10:
If we divide 3490 by 639, we get 5 and a remainder of 295.
The next digit of our result is 5. 
Result so far: 142433.95
The remainder is 295 after subtracting 3195 from 3490.
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 11:
639 goes into 2950 4 times with a remainder of 394.
Write down 4 as next digit of the result. 
Result so far: 142433.954
Subtract 2556 from 2950 to get 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Going ahead to step 12:
If we divide 3940 by 639, we get 6 and a remainder of 106.
Write down 6 as next digit of the result. 
Result so far: 142433.9546
If we take 3834 away from 3940, we end up with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Let's proceed to step 13:
If we divide 1060 by 639, we get 1 and a remainder of 421.
Record the quotient 1 as the next digit in the result. 
Result so far: 142433.95461
The remainder is 421 after subtracting 639 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4210, and continue the process.

Advancing to step 14:
If we divide 4210 by 639, we get 6 and a remainder of 376.
The next digit of our result is 6. 
Result so far: 142433.954616
Subtract 3834 from 4210 to get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Step 15:
3760 divided by 639 is 5 with a remainder of 565.
Write down 5 as next digit of the result. 
Result so far: 142433.9546165
The remainder is 565 after subtracting 3195 from 3760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5650, and continue the process.

Step 16:
The number 639 fits into 5650 8 times, leaving a remainder of 538.
Put 8 as the next digit of the answer. 
Result so far: 142433.95461658
The remainder is 538 after subtracting 5112 from 5650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5380, and continue the process.

In conclusion, the division gives 142433.95461658 with a balance of 5.38e-07.