We look at the division of 23438539 by 438 
The aim is to understand the frequency of 438 in 23438539.

Advancing to step 1:
When dividing 2 by 438, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 438

Moving on to step 2:
438 goes into 23 0 times with a remainder of 23.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 23 leaves us with 23.
Fetch the next digit (4) from the dividend, attach it to 23 and continue: 234 / 438

On to step 3:
438 can be fit into 234 0 times, resulting in a remainder of 234.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 234 leaves us with 234.
Take the next digit (3) from the dividend and append it to 234, then repeat: 2343 / 438

Advancing to step 4:
438 goes into 2343 5 times with a remainder of 153.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
The remainder is 153 after subtracting 2190 from 2343.
Take the next digit (8) from the dividend and append it to 153, then repeat: 1538 / 438

Moving on to step 5:
1538 divided by 438 is 3 with a remainder of 224.
Put 3 as the next digit of the answer. 
Result so far: 53.0
If we take 1314 away from 1538, we end up with 224.
Append the next digit (5) from the dividend to 224 and continue with: 2245 / 438

Step 6:
When dividing 2245 by 438, we get 5 with a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 535.0
Subtract 2190 from 2245 to get 55.
Append the next digit (3) from the dividend to 55 and continue with: 553 / 438

Moving on to step 7:
The number 438 fits into 553 1 times, leaving a remainder of 115.
The number 1 becomes the next digit in our result. 
Result so far: 5351.0
If we take 438 away from 553, we end up with 115.
Append the next digit (9) from the dividend to 115 and continue with: 1159 / 438

Step 8:
438 can be fit into 1159 2 times, resulting in a remainder of 283.
Write down 2 as next digit of the result. 
Result so far: 53512.0
Subtract 876 from 1159 to get 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

On to step 9:
2830 divided by 438 is 6 with a remainder of 202.
The next digit of our result is 6. 
Result so far: 53512.6
Subtract 2628 from 2830 to get 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Advancing to step 10:
If we divide 2020 by 438, we get 4 and a remainder of 268.
Use 4 as the next digit of our solution. 
Result so far: 53512.64
If we subtract 1752 from 2020, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Going ahead to step 11:
2680 divided by 438 is 6 with a remainder of 52.
Put 6 as the next digit of the answer. 
Result so far: 53512.646
Deduct 2628 from 2680 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 12:
The number 438 fits into 520 1 times, leaving a remainder of 82.
The number 1 becomes the next digit in our result. 
Result so far: 53512.6461
The remainder is 82 after subtracting 438 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 13:
The number 438 fits into 820 1 times, leaving a remainder of 382.
Put 1 as the next digit of the answer. 
Result so far: 53512.64611
Deduct 438 from 820 and we're left with 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

The final result is 53512.64611 with a remainder of 0.000382.