We're dividing 12903406 by 138 
The aim is to understand the frequency of 138 in 12903406.

Going ahead to step 1:
138 can be fit into 1 0 times, resulting in a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 138

Moving on to step 2:
138 can be fit into 12 0 times, resulting in a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 138

Step 3:
When dividing 129 by 138, we get 0 with a remainder of 129.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 129 after subtracting 0 from 129.
Grab the next digit (0) from the dividend, add it to 129, then carry on: 1290 / 138

Moving on to step 4:
If we divide 1290 by 138, we get 9 and a remainder of 48.
The next digit of our result is 9. 
Result so far: 9.0
Subtract 1242 from 1290 to get 48.
Fetch the next digit (3) from the dividend, attach it to 48 and continue: 483 / 138

Step 5:
The number 138 fits into 483 3 times, leaving a remainder of 69.
Write down 3 as next digit of the result. 
Result so far: 93.0
Deduct 414 from 483 and we're left with 69.
Append the next digit (4) from the dividend to 69 and continue with: 694 / 138

Let's proceed to step 6:
694 divided by 138 is 5 with a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 935.0
If we subtract 690 from 694, we get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 138

Advancing to step 7:
If we divide 40 by 138, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 9350.0
Deduct 0 from 40 and we're left with 40.
Append the next digit (6) from the dividend to 40 and continue with: 406 / 138

Advancing to step 8:
When dividing 406 by 138, we get 2 with a remainder of 130.
The number 2 becomes the next digit in our result. 
Result so far: 93502.0
Subtracting 276 from 406 leaves us with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Advancing to step 9:
138 goes into 1300 9 times with a remainder of 58.
The next digit of our result is 9. 
Result so far: 93502.9
The remainder is 58 after subtracting 1242 from 1300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 10:
138 goes into 580 4 times with a remainder of 28.
Use 4 as the next digit of our solution. 
Result so far: 93502.94
Deduct 552 from 580 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 11:
138 goes into 280 2 times with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 93502.942
If we take 276 away from 280, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 12:
40 divided by 138 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 93502.942
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 13:
400 divided by 138 is 2 with a remainder of 124.
Use 2 as the next digit of our solution. 
Result so far: 93502.94202
If we take 276 away from 400, we end up with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

On to step 14:
1240 divided by 138 is 8 with a remainder of 136.
Record the quotient 8 as the next digit in the result. 
Result so far: 93502.942028
Subtract 1104 from 1240 to get 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Let's proceed to step 15:
The number 138 fits into 1360 9 times, leaving a remainder of 118.
The next digit of our result is 9. 
Result so far: 93502.9420289
Deduct 1242 from 1360 and we're left with 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

Moving on to step 16:
1180 divided by 138 is 8 with a remainder of 76.
Use 8 as the next digit of our solution. 
Result so far: 93502.94202898
The remainder is 76 after subtracting 1104 from 1180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The final outcome is 93502.94202898, with a leftover of 7.6e-08.