812042 ÷ 71 
The aim is to understand the frequency of 71 in 812042.

On to step 1:
When dividing 8 by 71, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 71

Moving on to step 2:
71 goes into 81 1 times with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 71 from 81 and we're left with 10.
Take the next digit (2) from the dividend and append it to 10, then repeat: 102 / 71

Advancing to step 3:
If we divide 102 by 71, we get 1 and a remainder of 31.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we subtract 71 from 102, we get 31.
Bring next digit (0) of the dividend behind the 31 and repeat the process: 310 / 71

Going ahead to step 4:
71 can be fit into 310 4 times, resulting in a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 114.0
The remainder is 26 after subtracting 284 from 310.
Include the next digit (4) from the dividend after 26, then repeat: 264 / 71

On to step 5:
71 can be fit into 264 3 times, resulting in a remainder of 51.
Use 3 as the next digit of our solution. 
Result so far: 1143.0
Subtract 213 from 264 to get 51.
Grab the next digit (2) from the dividend, add it to 51, then carry on: 512 / 71

On to step 6:
When dividing 512 by 71, we get 7 with a remainder of 15.
Write down 7 as next digit of the result. 
Result so far: 11437.0
Deduct 497 from 512 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
The number 71 fits into 150 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 11437.2
If we subtract 142 from 150, we get 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 8:
The number 71 fits into 80 1 times, leaving a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 11437.21
Subtract 71 from 80 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 9:
The number 71 fits into 90 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 11437.211
Subtracting 71 from 90 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final outcome is 11437.211, with a leftover of 0.0019.