Let's divide 91312121 by 620
The aim is to understand the frequency of 620 in 91312121.

Let's proceed to step 1:
If we divide 9 by 620, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 620

Advancing to step 2:
620 can be fit into 91 0 times, resulting in a remainder of 91.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 91, we get 91.
Fetch the next digit (3) from the dividend, attach it to 91 and continue: 913 / 620

On to step 3:
When dividing 913 by 620, we get 1 with a remainder of 293.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 293 after subtracting 620 from 913.
Bring next digit (1) of the dividend behind the 293 and repeat the process: 2931 / 620

Step 4:
If we divide 2931 by 620, we get 4 and a remainder of 451.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Subtract 2480 from 2931 to get 451.
Take the next digit (2) from the dividend and append it to 451, then repeat: 4512 / 620

Moving on to step 5:
The number 620 fits into 4512 7 times, leaving a remainder of 172.
The number 7 becomes the next digit in our result. 
Result so far: 147.0
The remainder is 172 after subtracting 4340 from 4512.
Fetch the next digit (1) from the dividend, attach it to 172 and continue: 1721 / 620

Advancing to step 6:
620 goes into 1721 2 times with a remainder of 481.
Write down 2 as next digit of the result. 
Result so far: 1472.0
Subtracting 1240 from 1721 leaves us with 481.
Include the next digit (2) from the dividend after 481, then repeat: 4812 / 620

Step 7:
4812 divided by 620 is 7 with a remainder of 472.
Record the quotient 7 as the next digit in the result. 
Result so far: 14727.0
Subtract 4340 from 4812 to get 472.
Bring next digit (1) of the dividend behind the 472 and repeat the process: 4721 / 620

Moving on to step 8:
620 goes into 4721 7 times with a remainder of 381.
Use 7 as the next digit of our solution. 
Result so far: 147277.0
The remainder is 381 after subtracting 4340 from 4721.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Step 9:
If we divide 3810 by 620, we get 6 and a remainder of 90.
Record the quotient 6 as the next digit in the result. 
Result so far: 147277.6
Deduct 3720 from 3810 and we're left with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Step 10:
When dividing 900 by 620, we get 1 with a remainder of 280.
Put 1 as the next digit of the answer. 
Result so far: 147277.61
Subtract 620 from 900 to get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Moving on to step 11:
620 goes into 2800 4 times with a remainder of 320.
Write down 4 as next digit of the result. 
Result so far: 147277.614
The remainder is 320 after subtracting 2480 from 2800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 12:
The number 620 fits into 3200 5 times, leaving a remainder of 100.
Put 5 as the next digit of the answer. 
Result so far: 147277.6145
If we take 3100 away from 3200, we end up with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 13:
1000 divided by 620 is 1 with a remainder of 380.
The next digit of our result is 1. 
Result so far: 147277.61451
Deduct 620 from 1000 and we're left with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Moving on to step 14:
3800 divided by 620 is 6 with a remainder of 80.
The number 6 becomes the next digit in our result. 
Result so far: 147277.614516
Subtract 3720 from 3800 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 15:
800 divided by 620 is 1 with a remainder of 180.
The next digit of our result is 1. 
Result so far: 147277.6145161
If we subtract 620 from 800, we get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Moving on to step 16:
If we divide 1800 by 620, we get 2 and a remainder of 560.
Record the quotient 2 as the next digit in the result. 
Result so far: 147277.61451612
If we take 1240 away from 1800, we end up with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

After the division, we end up with 147277.61451612 and a remainder of 5.6e-07.