689770 divided by 81 
The aim is to understand the frequency of 81 in 689770.

Going ahead to step 1:
81 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 81

Let's proceed to step 2:
81 goes into 68 0 times with a remainder of 68.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 68, we get 68.
Grab the next digit (9) from the dividend, add it to 68, then carry on: 689 / 81

On to step 3:
81 goes into 689 8 times with a remainder of 41.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 648 from 689, we get 41.
Fetch the next digit (7) from the dividend, attach it to 41 and continue: 417 / 81

Step 4:
The number 81 fits into 417 5 times, leaving a remainder of 12.
The number 5 becomes the next digit in our result. 
Result so far: 85.0
Subtract 405 from 417 to get 12.
Take the next digit (7) from the dividend and append it to 12, then repeat: 127 / 81

On to step 5:
If we divide 127 by 81, we get 1 and a remainder of 46.
Write down 1 as next digit of the result. 
Result so far: 851.0
Subtract 81 from 127 to get 46.
Fetch the next digit (0) from the dividend, attach it to 46 and continue: 460 / 81

Let's proceed to step 6:
81 goes into 460 5 times with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 8515.0
The remainder is 55 after subtracting 405 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 7:
The number 81 fits into 550 6 times, leaving a remainder of 64.
The next digit of our result is 6. 
Result so far: 8515.6
If we take 486 away from 550, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 8:
81 goes into 640 7 times with a remainder of 73.
Record the quotient 7 as the next digit in the result. 
Result so far: 8515.67
If we subtract 567 from 640, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 9:
The number 81 fits into 730 9 times, leaving a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 8515.679
Subtracting 729 from 730 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 10:
If we divide 10 by 81, we get 0 and a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 8515.679
If we take 0 away from 10, we end up 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.

Going ahead to step 11:
When dividing 100 by 81, we get 1 with a remainder of 19.
The next digit of our result is 1. 
Result so far: 8515.67901
If we take 81 away from 100, we end up 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.

Advancing to step 12:
81 goes into 190 2 times with a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 8515.679012
The remainder is 28 after subtracting 162 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 13:
When dividing 280 by 81, we get 3 with a remainder of 37.
The next digit of our result is 3. 
Result so far: 8515.6790123
Deduct 243 from 280 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 14:
The number 81 fits into 370 4 times, leaving a remainder of 46.
Record the quotient 4 as the next digit in the result. 
Result so far: 8515.67901234
Subtracting 324 from 370 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

The quotient of the division is 8515.67901234, and the remainder is 4.6e-08.