We're dividing 20235121 by 690 
The aim is to understand the frequency of 690 in 20235121.

Going ahead to step 1:
690 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 690

On to step 2:
The number 690 fits into 20 0 times, leaving a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Bring next digit (2) of the dividend behind the 20 and repeat the process: 202 / 690

Moving on to step 3:
If we divide 202 by 690, we get 0 and a remainder of 202.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 202 and we're left with 202.
Grab the next digit (3) from the dividend, add it to 202, then carry on: 2023 / 690

Moving on to step 4:
690 goes into 2023 2 times with a remainder of 643.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 1380 from 2023 leaves us with 643.
Grab the next digit (5) from the dividend, add it to 643, then carry on: 6435 / 690

Let's proceed to step 5:
When dividing 6435 by 690, we get 9 with a remainder of 225.
The number 9 becomes the next digit in our result. 
Result so far: 29.0
Subtract 6210 from 6435 to get 225.
Take the next digit (1) from the dividend and append it to 225, then repeat: 2251 / 690

Step 6:
When dividing 2251 by 690, we get 3 with a remainder of 181.
Record the quotient 3 as the next digit in the result. 
Result so far: 293.0
The remainder is 181 after subtracting 2070 from 2251.
Include the next digit (2) from the dividend after 181, then repeat: 1812 / 690

On to step 7:
When dividing 1812 by 690, we get 2 with a remainder of 432.
Use 2 as the next digit of our solution. 
Result so far: 2932.0
Subtracting 1380 from 1812 leaves us with 432.
Bring next digit (1) of the dividend behind the 432 and repeat the process: 4321 / 690

Going ahead to step 8:
690 can be fit into 4321 6 times, resulting in a remainder of 181.
Write down 6 as next digit of the result. 
Result so far: 29326.0
The remainder is 181 after subtracting 4140 from 4321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Moving on to step 9:
690 can be fit into 1810 2 times, resulting in a remainder of 430.
The number 2 becomes the next digit in our result. 
Result so far: 29326.2
Subtract 1380 from 1810 to get 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Step 10:
If we divide 4300 by 690, we get 6 and a remainder of 160.
The next digit of our result is 6. 
Result so far: 29326.26
Deduct 4140 from 4300 and we're left with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Step 11:
690 goes into 1600 2 times with a remainder of 220.
Put 2 as the next digit of the answer. 
Result so far: 29326.262
Subtract 1380 from 1600 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

On to step 12:
690 can be fit into 2200 3 times, resulting in a remainder of 130.
The next digit of our result is 3. 
Result so far: 29326.2623
Subtracting 2070 from 2200 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.

Moving on to step 13:
690 goes into 1300 1 times with a remainder of 610.
The number 1 becomes the next digit in our result. 
Result so far: 29326.26231
Deduct 690 from 1300 and we're left with 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Step 14:
690 goes into 6100 8 times with a remainder of 580.
The number 8 becomes the next digit in our result. 
Result so far: 29326.262318
Subtracting 5520 from 6100 leaves us with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Step 15:
690 goes into 5800 8 times with a remainder of 280.
Record the quotient 8 as the next digit in the result. 
Result so far: 29326.2623188
Deduct 5520 from 5800 and we're left with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Our division results in 29326.2623188 with a remaining 2.8e-06.