Let's divide 39960523 by 355
The aim is to understand the frequency of 355 in 39960523.

On to step 1:
If we divide 3 by 355, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 355

Going ahead to step 2:
355 can be fit into 39 0 times, resulting in a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Bring next digit (9) of the dividend behind the 39 and repeat the process: 399 / 355

Moving on to step 3:
355 can be fit into 399 1 times, resulting in a remainder of 44.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 355 from 399 leaves us with 44.
Append the next digit (6) from the dividend to 44 and continue with: 446 / 355

On to step 4:
When dividing 446 by 355, we get 1 with a remainder of 91.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
If we subtract 355 from 446, we get 91.
Fetch the next digit (0) from the dividend, attach it to 91 and continue: 910 / 355

Step 5:
When dividing 910 by 355, we get 2 with a remainder of 200.
The next digit of our result is 2. 
Result so far: 112.0
Deduct 710 from 910 and we're left with 200.
Append the next digit (5) from the dividend to 200 and continue with: 2005 / 355

Let's proceed to step 6:
The number 355 fits into 2005 5 times, leaving a remainder of 230.
Write down 5 as next digit of the result. 
Result so far: 1125.0
If we take 1775 away from 2005, we end up with 230.
Bring next digit (2) of the dividend behind the 230 and repeat the process: 2302 / 355

Advancing to step 7:
When dividing 2302 by 355, we get 6 with a remainder of 172.
The next digit of our result is 6. 
Result so far: 11256.0
Subtract 2130 from 2302 to get 172.
Fetch the next digit (3) from the dividend, attach it to 172 and continue: 1723 / 355

On to step 8:
The number 355 fits into 1723 4 times, leaving a remainder of 303.
Put 4 as the next digit of the answer. 
Result so far: 112564.0
If we subtract 1420 from 1723, we get 303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

Moving on to step 9:
If we divide 3030 by 355, we get 8 and a remainder of 190.
The next digit of our result is 8. 
Result so far: 112564.8
The remainder is 190 after subtracting 2840 from 3030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Advancing to step 10:
If we divide 1900 by 355, we get 5 and a remainder of 125.
Write down 5 as next digit of the result. 
Result so far: 112564.85
Deduct 1775 from 1900 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 11:
When dividing 1250 by 355, we get 3 with a remainder of 185.
Put 3 as the next digit of the answer. 
Result so far: 112564.853
Subtracting 1065 from 1250 leaves us with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

On to step 12:
If we divide 1850 by 355, we get 5 and a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 112564.8535
If we subtract 1775 from 1850, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 13:
355 goes into 750 2 times with a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 112564.85352
Deduct 710 from 750 and we're left 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.

Moving on to step 14:
When dividing 400 by 355, we get 1 with a remainder of 45.
The number 1 becomes the next digit in our result. 
Result so far: 112564.853521
If we take 355 away from 400, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 15:
When dividing 450 by 355, we get 1 with a remainder of 95.
Use 1 as the next digit of our solution. 
Result so far: 112564.8535211
If we take 355 away from 450, we end up with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

After the division, we end up with 112564.8535211 and a remainder of 9.5e-07.