786421 ÷ 71 
The aim is to understand the frequency of 71 in 786421.

Step 1:
If we divide 7 by 71, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 71

Step 2:
If we divide 78 by 71, we get 1 and a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 71 away from 78, we end up with 7.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 71

Advancing to step 3:
If we divide 76 by 71, we get 1 and a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we take 71 away from 76, we end up with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 71

Moving on to step 4:
The number 71 fits into 54 0 times, leaving a remainder of 54.
Put 0 as the next digit of the answer. 
Result so far: 110.0
Deduct 0 from 54 and we're left with 54.
Take the next digit (2) from the dividend and append it to 54, then repeat: 542 / 71

Going ahead to step 5:
If we divide 542 by 71, we get 7 and a remainder of 45.
The next digit of our result is 7. 
Result so far: 1107.0
Deduct 497 from 542 and we're left with 45.
Take the next digit (1) from the dividend and append it to 45, then repeat: 451 / 71

On to step 6:
The number 71 fits into 451 6 times, leaving a remainder of 25.
Write down 6 as next digit of the result. 
Result so far: 11076.0
Subtracting 426 from 451 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 7:
71 goes into 250 3 times with a remainder of 37.
Record the quotient 3 as the next digit in the result. 
Result so far: 11076.3
If we subtract 213 from 250, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 8:
71 can be fit into 370 5 times, resulting in a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 11076.35
Subtracting 355 from 370 leaves us 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 9:
150 divided by 71 is 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 11076.352
Subtract 142 from 150 to 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.

On to step 10:
When dividing 80 by 71, we get 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 11076.3521
If we take 71 away from 80, we end up with 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 11:
When dividing 90 by 71, we get 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 11076.35211
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 11076.35211, with a leftover of 1.9e-05.