81211298 ÷ 586 
The aim is to understand the frequency of 586 in 81211298.

Let's proceed to step 1:
When dividing 8 by 586, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 586

Step 2:
586 goes into 81 0 times with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Fetch the next digit (2) from the dividend, attach it to 81 and continue: 812 / 586

Step 3:
The number 586 fits into 812 1 times, leaving a remainder of 226.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 226 after subtracting 586 from 812.
Take the next digit (1) from the dividend and append it to 226, then repeat: 2261 / 586

Going ahead to step 4:
586 can be fit into 2261 3 times, resulting in a remainder of 503.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Subtracting 1758 from 2261 leaves us with 503.
Include the next digit (1) from the dividend after 503, then repeat: 5031 / 586

On to step 5:
The number 586 fits into 5031 8 times, leaving a remainder of 343.
The number 8 becomes the next digit in our result. 
Result so far: 138.0
The remainder is 343 after subtracting 4688 from 5031.
Take the next digit (2) from the dividend and append it to 343, then repeat: 3432 / 586

On to step 6:
586 can be fit into 3432 5 times, resulting in a remainder of 502.
Use 5 as the next digit of our solution. 
Result so far: 1385.0
If we take 2930 away from 3432, we end up with 502.
Include the next digit (9) from the dividend after 502, then repeat: 5029 / 586

On to step 7:
586 can be fit into 5029 8 times, resulting in a remainder of 341.
The next digit of our result is 8. 
Result so far: 13858.0
The remainder is 341 after subtracting 4688 from 5029.
Append the next digit (8) from the dividend to 341 and continue with: 3418 / 586

Moving on to step 8:
3418 divided by 586 is 5 with a remainder of 488.
Put 5 as the next digit of the answer. 
Result so far: 138585.0
If we take 2930 away from 3418, we end up with 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

Step 9:
586 goes into 4880 8 times with a remainder of 192.
Write down 8 as next digit of the result. 
Result so far: 138585.8
Subtract 4688 from 4880 to get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Going ahead to step 10:
The number 586 fits into 1920 3 times, leaving a remainder of 162.
Put 3 as the next digit of the answer. 
Result so far: 138585.83
Subtract 1758 from 1920 to get 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Moving on to step 11:
The number 586 fits into 1620 2 times, leaving a remainder of 448.
Use 2 as the next digit of our solution. 
Result so far: 138585.832
The remainder is 448 after subtracting 1172 from 1620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Advancing to step 12:
586 can be fit into 4480 7 times, resulting in a remainder of 378.
Record the quotient 7 as the next digit in the result. 
Result so far: 138585.8327
The remainder is 378 after subtracting 4102 from 4480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

Step 13:
3780 divided by 586 is 6 with a remainder of 264.
Record the quotient 6 as the next digit in the result. 
Result so far: 138585.83276
The remainder is 264 after subtracting 3516 from 3780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Going ahead to step 14:
586 goes into 2640 4 times with a remainder of 296.
The next digit of our result is 4. 
Result so far: 138585.832764
If we subtract 2344 from 2640, we get 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

On to step 15:
586 goes into 2960 5 times with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 138585.8327645
Subtracting 2930 from 2960 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 16:
586 can be fit into 300 0 times, resulting in a remainder of 300.
Write down 0 as next digit of the result. 
Result so far: 138585.8327645
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The final outcome is 138585.8327645, with a leftover of 3e-07.