211866 divided by 10 
The aim is to understand the frequency of 10 in 211866.

Let's proceed to step 1:
10 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 10

Step 2:
21 divided by 10 is 2 with a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 20 from 21 and we're left with 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 10

Advancing to step 3:
10 goes into 11 1 times with a remainder of 1.
The next digit of our result is 1. 
Result so far: 21.0
Subtract 10 from 11 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 10

Moving on to step 4:
18 divided by 10 is 1 with a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 211.0
The remainder is 8 after subtracting 10 from 18.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 10

Let's proceed to step 5:
10 can be fit into 86 8 times, resulting in a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 2118.0
If we take 80 away from 86, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 10

Moving on to step 6:
10 goes into 66 6 times with a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 21186.0
The remainder is 6 after subtracting 60 from 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
60 divided by 10 is 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 21186.6
Subtract 60 from 60 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
The number 10 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 21186.6
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
0 divided by 10 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 21186.6
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 21186.6, with a leftover of 0.0.