67640393 ÷ 438 
The aim is to understand the frequency of 438 in 67640393.

Let's proceed to step 1:
The number 438 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 438

On to step 2:
438 can be fit into 67 0 times, resulting in a remainder of 67.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 67 to get 67.
Bring next digit (6) of the dividend behind the 67 and repeat the process: 676 / 438

On to step 3:
438 goes into 676 1 times with a remainder of 238.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 438 from 676 to get 238.
Append the next digit (4) from the dividend to 238 and continue with: 2384 / 438

Step 4:
When dividing 2384 by 438, we get 5 with a remainder of 194.
Write down 5 as next digit of the result. 
Result so far: 15.0
The remainder is 194 after subtracting 2190 from 2384.
Append the next digit (0) from the dividend to 194 and continue with: 1940 / 438

Moving on to step 5:
The number 438 fits into 1940 4 times, leaving a remainder of 188.
Use 4 as the next digit of our solution. 
Result so far: 154.0
Subtracting 1752 from 1940 leaves us with 188.
Bring next digit (3) of the dividend behind the 188 and repeat the process: 1883 / 438

Step 6:
When dividing 1883 by 438, we get 4 with a remainder of 131.
Use 4 as the next digit of our solution. 
Result so far: 1544.0
If we subtract 1752 from 1883, we get 131.
Include the next digit (9) from the dividend after 131, then repeat: 1319 / 438

Advancing to step 7:
If we divide 1319 by 438, we get 3 and a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 15443.0
Subtract 1314 from 1319 to get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 438

On to step 8:
438 can be fit into 53 0 times, resulting in a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 154430.0
The remainder is 53 after subtracting 0 from 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 9:
438 can be fit into 530 1 times, resulting in a remainder of 92.
Use 1 as the next digit of our solution. 
Result so far: 154430.1
Deduct 438 from 530 and we're left with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Advancing to step 10:
When dividing 920 by 438, we get 2 with a remainder of 44.
Put 2 as the next digit of the answer. 
Result so far: 154430.12
Subtracting 876 from 920 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 11:
438 can be fit into 440 1 times, resulting in a remainder of 2.
The next digit of our result is 1. 
Result so far: 154430.121
Subtracting 438 from 440 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 12:
When dividing 20 by 438, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 154430.121
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 13:
The number 438 fits into 200 0 times, leaving a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 154430.121
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

In conclusion, the division gives 154430.121 with a balance of 0.0002.