We look at the division of 210966 by 17 
The aim is to understand the frequency of 17 in 210966.

Advancing to step 1:
The number 17 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 17

Advancing to step 2:
21 divided by 17 is 1 with a remainder of 4.
The next digit of our result is 1. 
Result so far: 1.0
If we take 17 away from 21, we end up with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 17

On to step 3:
17 goes into 40 2 times with a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 12.0
Deduct 34 from 40 and we're left with 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 17

Let's proceed to step 4:
17 goes into 69 4 times with a remainder of 1.
The next digit of our result is 4. 
Result so far: 124.0
The remainder is 1 after subtracting 68 from 69.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 17

Moving on to step 5:
The number 17 fits into 16 0 times, leaving a remainder of 16.
The next digit of our result is 0. 
Result so far: 1240.0
Subtract 0 from 16 to get 16.
Take the next digit (6) from the dividend and append it to 16, then repeat: 166 / 17

Moving on to step 6:
When dividing 166 by 17, we get 9 with a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 12409.0
The remainder is 13 after subtracting 153 from 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
17 can be fit into 130 7 times, resulting in a remainder of 11.
Use 7 as the next digit of our solution. 
Result so far: 12409.7
Subtracting 119 from 130 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 8:
When dividing 110 by 17, we get 6 with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 12409.76
Deduct 102 from 110 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
If we divide 80 by 17, we get 4 and a remainder of 12.
The next digit of our result is 4. 
Result so far: 12409.764
The remainder is 12 after subtracting 68 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 10:
120 divided by 17 is 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 12409.7647
The remainder is 1 after subtracting 119 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 11:
17 goes into 10 0 times with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 12409.7647
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 12:
The number 17 fits into 100 5 times, leaving a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 12409.764705
If we subtract 85 from 100, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 13:
If we divide 150 by 17, we get 8 and a remainder of 14.
Use 8 as the next digit of our solution. 
Result so far: 12409.7647058
Subtract 136 from 150 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 14:
17 can be fit into 140 8 times, resulting in a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 12409.76470588
Subtract 136 from 140 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

After the division, we end up with 12409.76470588 and a remainder of 4e-09.