We're dividing 138902 by 70 
The aim is to understand the frequency of 70 in 138902.

Advancing to step 1:
If we divide 1 by 70, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 70

Advancing to step 2:
13 divided by 70 is 0 with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Grab the next digit (8) from the dividend, add it to 13, then carry on: 138 / 70

Step 3:
The number 70 fits into 138 1 times, leaving a remainder of 68.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 70 from 138 to get 68.
Fetch the next digit (9) from the dividend, attach it to 68 and continue: 689 / 70

Moving on to step 4:
70 can be fit into 689 9 times, resulting in a remainder of 59.
Use 9 as the next digit of our solution. 
Result so far: 19.0
Subtracting 630 from 689 leaves us with 59.
Grab the next digit (0) from the dividend, add it to 59, then carry on: 590 / 70

Let's proceed to step 5:
The number 70 fits into 590 8 times, leaving a remainder of 30.
Record the quotient 8 as the next digit in the result. 
Result so far: 198.0
If we take 560 away from 590, we end up with 30.
Take the next digit (2) from the dividend and append it to 30, then repeat: 302 / 70

Let's proceed to step 6:
If we divide 302 by 70, we get 4 and a remainder of 22.
The number 4 becomes the next digit in our result. 
Result so far: 1984.0
The remainder is 22 after subtracting 280 from 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 7:
220 divided by 70 is 3 with a remainder of 10.
Put 3 as the next digit of the answer. 
Result so far: 1984.3
If we subtract 210 from 220, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
100 divided by 70 is 1 with a remainder of 30.
The number 1 becomes the next digit in our result. 
Result so far: 1984.31
Subtracting 70 from 100 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 9:
The number 70 fits into 300 4 times, leaving a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 1984.314
The remainder is 20 after subtracting 280 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 10:
70 can be fit into 200 2 times, resulting in a remainder of 60.
Use 2 as the next digit of our solution. 
Result so far: 1984.3142
Subtract 140 from 200 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 11:
600 divided by 70 is 8 with a remainder of 40.
Write down 8 as next digit of the result. 
Result so far: 1984.31428
If we take 560 away from 600, we end up 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.

Going ahead to step 12:
The number 70 fits into 400 5 times, leaving a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 1984.314285
Deduct 350 from 400 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 13:
500 divided by 70 is 7 with a remainder of 10.
The next digit of our result is 7. 
Result so far: 1984.3142857
The remainder is 10 after subtracting 490 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 14:
The number 70 fits into 100 1 times, leaving a remainder of 30.
The next digit of our result is 1. 
Result so far: 1984.31428571
Subtracting 70 from 100 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 1984.31428571, with a leftover of 3e-08.