1221226 divided by 355 
The aim is to understand the frequency of 355 in 1221226.

Moving on to step 1:
The number 355 fits into 1 0 times, leaving 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.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 355

On to step 2:
The number 355 fits into 12 0 times, leaving a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Take the next digit (2) from the dividend and append it to 12, then repeat: 122 / 355

Step 3:
122 divided by 355 is 0 with a remainder of 122.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 122 to get 122.
Take the next digit (1) from the dividend and append it to 122, then repeat: 1221 / 355

Moving on to step 4:
1221 divided by 355 is 3 with a remainder of 156.
The next digit of our result is 3. 
Result so far: 3.0
If we take 1065 away from 1221, we end up with 156.
Bring next digit (2) of the dividend behind the 156 and repeat the process: 1562 / 355

On to step 5:
1562 divided by 355 is 4 with a remainder of 142.
The next digit of our result is 4. 
Result so far: 34.0
If we subtract 1420 from 1562, we get 142.
Bring next digit (2) of the dividend behind the 142 and repeat the process: 1422 / 355

Step 6:
When dividing 1422 by 355, we get 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 344.0
Subtracting 1420 from 1422 leaves us with 2.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 355

Going ahead to step 7:
26 divided by 355 is 0 with a remainder of 26.
Write down 0 as next digit of the result. 
Result so far: 3440.0
Deduct 0 from 26 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 8:
The number 355 fits into 260 0 times, leaving a remainder of 260.
The next digit of our result is 0. 
Result so far: 3440.0
If we subtract 0 from 260, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Moving on to step 9:
2600 divided by 355 is 7 with a remainder of 115.
Record the quotient 7 as the next digit in the result. 
Result so far: 3440.07
Subtracting 2485 from 2600 leaves us with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Advancing to step 10:
355 can be fit into 1150 3 times, resulting in a remainder of 85.
Record the quotient 3 as the next digit in the result. 
Result so far: 3440.073
If we subtract 1065 from 1150, we get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 11:
355 goes into 850 2 times with a remainder of 140.
Record the quotient 2 as the next digit in the result. 
Result so far: 3440.0732
Subtracting 710 from 850 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 12:
1400 divided by 355 is 3 with a remainder of 335.
Record the quotient 3 as the next digit in the result. 
Result so far: 3440.07323
The remainder is 335 after subtracting 1065 from 1400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

On to step 13:
355 goes into 3350 9 times with a remainder of 155.
Record the quotient 9 as the next digit in the result. 
Result so far: 3440.073239
Deduct 3195 from 3350 and we're left with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Step 14:
355 goes into 1550 4 times with a remainder of 130.
Record the quotient 4 as the next digit in the result. 
Result so far: 3440.0732394
Subtracting 1420 from 1550 leaves us with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Step 15:
355 goes into 1300 3 times with a remainder of 235.
Use 3 as the next digit of our solution. 
Result so far: 3440.07323943
Deduct 1065 from 1300 and we're left with 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

After the division, we end up with 3440.07323943 and a remainder of 2.35e-07.