72243973 ÷ 355 
The aim is to understand the frequency of 355 in 72243973.

Step 1:
When dividing 7 by 355, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 355

On to step 2:
If we divide 72 by 355, we get 0 and a remainder of 72.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 72, we get 72.
Fetch the next digit (2) from the dividend, attach it to 72 and continue: 722 / 355

Step 3:
722 divided by 355 is 2 with a remainder of 12.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 710 from 722 leaves us with 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 355

Moving on to step 4:
355 can be fit into 124 0 times, resulting in a remainder of 124.
Use 0 as the next digit of our solution. 
Result so far: 20.0
The remainder is 124 after subtracting 0 from 124.
Take the next digit (3) from the dividend and append it to 124, then repeat: 1243 / 355

Advancing to step 5:
1243 divided by 355 is 3 with a remainder of 178.
Put 3 as the next digit of the answer. 
Result so far: 203.0
The remainder is 178 after subtracting 1065 from 1243.
Append the next digit (9) from the dividend to 178 and continue with: 1789 / 355

Advancing to step 6:
If we divide 1789 by 355, we get 5 and a remainder of 14.
Record the quotient 5 as the next digit in the result. 
Result so far: 2035.0
Subtracting 1775 from 1789 leaves us with 14.
Fetch the next digit (7) from the dividend, attach it to 14 and continue: 147 / 355

Advancing to step 7:
355 goes into 147 0 times with a remainder of 147.
The next digit of our result is 0. 
Result so far: 20350.0
If we subtract 0 from 147, we get 147.
Bring next digit (3) of the dividend behind the 147 and repeat the process: 1473 / 355

Let's proceed to step 8:
If we divide 1473 by 355, we get 4 and a remainder of 53.
Write down 4 as next digit of the result. 
Result so far: 203504.0
If we subtract 1420 from 1473, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 9:
If we divide 530 by 355, we get 1 and a remainder of 175.
Record the quotient 1 as the next digit in the result. 
Result so far: 203504.1
If we subtract 355 from 530, we get 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Let's proceed to step 10:
If we divide 1750 by 355, we get 4 and a remainder of 330.
Use 4 as the next digit of our solution. 
Result so far: 203504.14
If we take 1420 away from 1750, we end up with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Let's proceed to step 11:
The number 355 fits into 3300 9 times, leaving a remainder of 105.
The next digit of our result is 9. 
Result so far: 203504.149
Subtracting 3195 from 3300 leaves us with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Step 12:
When dividing 1050 by 355, we get 2 with a remainder of 340.
Write down 2 as next digit of the result. 
Result so far: 203504.1492
Subtracting 710 from 1050 leaves us with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Let's proceed to step 13:
355 goes into 3400 9 times with a remainder of 205.
Write down 9 as next digit of the result. 
Result so far: 203504.14929
If we take 3195 away from 3400, we end up with 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Let's proceed to step 14:
When dividing 2050 by 355, we get 5 with a remainder of 275.
The next digit of our result is 5. 
Result so far: 203504.149295
If we take 1775 away from 2050, we end up with 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Going ahead to step 15:
The number 355 fits into 2750 7 times, leaving a remainder of 265.
Record the quotient 7 as the next digit in the result. 
Result so far: 203504.1492957
Deduct 2485 from 2750 and we're left with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Moving on to step 16:
355 can be fit into 2650 7 times, resulting in a remainder of 165.
Use 7 as the next digit of our solution. 
Result so far: 203504.14929577
If we subtract 2485 from 2650, we get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

After the division, we end up with 203504.14929577 and a remainder of 1.65e-07.