We divide 988389 by 81
The aim is to understand the frequency of 81 in 988389.

On to step 1:
81 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 81

Moving on to step 2:
98 divided by 81 is 1 with a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 81 from 98 leaves us with 17.
Bring next digit (8) of the dividend behind the 17 and repeat the process: 178 / 81

Going ahead to step 3:
81 goes into 178 2 times with a remainder of 16.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtract 162 from 178 to get 16.
Take the next digit (3) from the dividend and append it to 16, then repeat: 163 / 81

Moving on to step 4:
163 divided by 81 is 2 with a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 122.0
Subtract 162 from 163 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 81

Advancing to step 5:
When dividing 18 by 81, we get 0 with a remainder of 18.
The number 0 becomes the next digit in our result. 
Result so far: 1220.0
The remainder is 18 after subtracting 0 from 18.
Bring next digit (9) of the dividend behind the 18 and repeat the process: 189 / 81

On to step 6:
When dividing 189 by 81, we get 2 with a remainder of 27.
The number 2 becomes the next digit in our result. 
Result so far: 12202.0
Deduct 162 from 189 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 7:
270 divided by 81 is 3 with a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 12202.3
Deduct 243 from 270 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 8:
When dividing 270 by 81, we get 3 with a remainder of 27.
Put 3 as the next digit of the answer. 
Result so far: 12202.33
Deduct 243 from 270 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The final result is 12202.33 with a remainder of 0.027.