We're dividing 20840429 by 210 
The aim is to understand the frequency of 210 in 20840429.

Let's proceed to step 1:
If we divide 2 by 210, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 210

Step 2:
When dividing 20 by 210, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 210

Moving on to step 3:
The number 210 fits into 208 0 times, leaving a remainder of 208.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 208 leaves us with 208.
Take the next digit (4) from the dividend and append it to 208, then repeat: 2084 / 210

On to step 4:
When dividing 2084 by 210, we get 9 with a remainder of 194.
The next digit of our result is 9. 
Result so far: 9.0
Subtract 1890 from 2084 to get 194.
Include the next digit (0) from the dividend after 194, then repeat: 1940 / 210

Advancing to step 5:
If we divide 1940 by 210, we get 9 and a remainder of 50.
Put 9 as the next digit of the answer. 
Result so far: 99.0
Deduct 1890 from 1940 and we're left with 50.
Bring next digit (4) of the dividend behind the 50 and repeat the process: 504 / 210

Moving on to step 6:
When dividing 504 by 210, we get 2 with a remainder of 84.
The next digit of our result is 2. 
Result so far: 992.0
Deduct 420 from 504 and we're left with 84.
Fetch the next digit (2) from the dividend, attach it to 84 and continue: 842 / 210

Advancing to step 7:
The number 210 fits into 842 4 times, leaving a remainder of 2.
The next digit of our result is 4. 
Result so far: 9924.0
Subtract 840 from 842 to get 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 210

Advancing to step 8:
When dividing 29 by 210, we get 0 with a remainder of 29.
Record the quotient 0 as the next digit in the result. 
Result so far: 99240.0
Subtracting 0 from 29 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Step 9:
210 goes into 290 1 times with a remainder of 80.
Use 1 as the next digit of our solution. 
Result so far: 99240.1
The remainder is 80 after subtracting 210 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 10:
210 can be fit into 800 3 times, resulting in a remainder of 170.
Write down 3 as next digit of the result. 
Result so far: 99240.13
If we take 630 away from 800, we end up with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Let's proceed to step 11:
210 goes into 1700 8 times with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 99240.138
Subtracting 1680 from 1700 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 12:
When dividing 200 by 210, we get 0 with a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 99240.138
Subtract 0 from 200 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 13:
The number 210 fits into 2000 9 times, leaving a remainder of 110.
The next digit of our result is 9. 
Result so far: 99240.13809
If we subtract 1890 from 2000, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

On to step 14:
210 goes into 1100 5 times with a remainder of 50.
The next digit of our result is 5. 
Result so far: 99240.138095
Subtracting 1050 from 1100 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 15:
210 can be fit into 500 2 times, resulting in a remainder of 80.
Record the quotient 2 as the next digit in the result. 
Result so far: 99240.1380952
The remainder is 80 after subtracting 420 from 500.
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 16:
210 goes into 800 3 times with a remainder of 170.
The number 3 becomes the next digit in our result. 
Result so far: 99240.13809523
If we subtract 630 from 800, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

The final outcome is 99240.13809523, with a leftover of 1.7e-07.