90967123 divided by 638 
The aim is to understand the frequency of 638 in 90967123.

Step 1:
638 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 638

Moving on to step 2:
When dividing 90 by 638, we get 0 with a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 90 after subtracting 0 from 90.
Grab the next digit (9) from the dividend, add it to 90, then carry on: 909 / 638

Step 3:
638 goes into 909 1 times with a remainder of 271.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 638 from 909 to get 271.
Bring next digit (6) of the dividend behind the 271 and repeat the process: 2716 / 638

Moving on to step 4:
When dividing 2716 by 638, we get 4 with a remainder of 164.
Write down 4 as next digit of the result. 
Result so far: 14.0
Deduct 2552 from 2716 and we're left with 164.
Fetch the next digit (7) from the dividend, attach it to 164 and continue: 1647 / 638

Let's proceed to step 5:
638 can be fit into 1647 2 times, resulting in a remainder of 371.
Use 2 as the next digit of our solution. 
Result so far: 142.0
Deduct 1276 from 1647 and we're left with 371.
Grab the next digit (1) from the dividend, add it to 371, then carry on: 3711 / 638

Going ahead to step 6:
If we divide 3711 by 638, we get 5 and a remainder of 521.
Use 5 as the next digit of our solution. 
Result so far: 1425.0
If we take 3190 away from 3711, we end up with 521.
Bring next digit (2) of the dividend behind the 521 and repeat the process: 5212 / 638

Going ahead to step 7:
638 can be fit into 5212 8 times, resulting in a remainder of 108.
Write down 8 as next digit of the result. 
Result so far: 14258.0
If we subtract 5104 from 5212, we get 108.
Include the next digit (3) from the dividend after 108, then repeat: 1083 / 638

Moving on to step 8:
638 goes into 1083 1 times with a remainder of 445.
The next digit of our result is 1. 
Result so far: 142581.0
Subtracting 638 from 1083 leaves us with 445.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

Moving on to step 9:
The number 638 fits into 4450 6 times, leaving a remainder of 622.
Put 6 as the next digit of the answer. 
Result so far: 142581.6
If we subtract 3828 from 4450, we get 622.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6220, and continue the process.

Advancing to step 10:
If we divide 6220 by 638, we get 9 and a remainder of 478.
The next digit of our result is 9. 
Result so far: 142581.69
If we subtract 5742 from 6220, we get 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Going ahead to step 11:
When dividing 4780 by 638, we get 7 with a remainder of 314.
Put 7 as the next digit of the answer. 
Result so far: 142581.697
Deduct 4466 from 4780 and we're left with 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Advancing to step 12:
When dividing 3140 by 638, we get 4 with a remainder of 588.
Put 4 as the next digit of the answer. 
Result so far: 142581.6974
If we take 2552 away from 3140, we end up with 588.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5880, and continue the process.

Let's proceed to step 13:
638 can be fit into 5880 9 times, resulting in a remainder of 138.
Put 9 as the next digit of the answer. 
Result so far: 142581.69749
Subtract 5742 from 5880 to get 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Let's proceed to step 14:
When dividing 1380 by 638, we get 2 with a remainder of 104.
Use 2 as the next digit of our solution. 
Result so far: 142581.697492
The remainder is 104 after subtracting 1276 from 1380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Moving on to step 15:
If we divide 1040 by 638, we get 1 and a remainder of 402.
Put 1 as the next digit of the answer. 
Result so far: 142581.6974921
If we take 638 away from 1040, we end up with 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

Going ahead to step 16:
The number 638 fits into 4020 6 times, leaving a remainder of 192.
Record the quotient 6 as the next digit in the result. 
Result so far: 142581.69749216
Deduct 3828 from 4020 and we're left with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

The final outcome is 142581.69749216, with a leftover of 1.92e-07.