Let's divide 686111 by 90
The aim is to understand the frequency of 90 in 686111.

Going ahead to step 1:
When dividing 6 by 90, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 90

Moving on to step 2:
90 goes into 68 0 times with a remainder of 68.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 68, we get 68.
Include the next digit (6) from the dividend after 68, then repeat: 686 / 90

Moving on to step 3:
When dividing 686 by 90, we get 7 with a remainder of 56.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 56 after subtracting 630 from 686.
Fetch the next digit (1) from the dividend, attach it to 56 and continue: 561 / 90

Going ahead to step 4:
The number 90 fits into 561 6 times, leaving a remainder of 21.
Record the quotient 6 as the next digit in the result. 
Result so far: 76.0
The remainder is 21 after subtracting 540 from 561.
Include the next digit (1) from the dividend after 21, then repeat: 211 / 90

Moving on to step 5:
The number 90 fits into 211 2 times, leaving a remainder of 31.
Put 2 as the next digit of the answer. 
Result so far: 762.0
Subtract 180 from 211 to get 31.
Bring next digit (1) of the dividend behind the 31 and repeat the process: 311 / 90

Moving on to step 6:
90 goes into 311 3 times with a remainder of 41.
The next digit of our result is 3. 
Result so far: 7623.0
If we take 270 away from 311, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 7:
410 divided by 90 is 4 with a remainder of 50.
Record the quotient 4 as the next digit in the result. 
Result so far: 7623.4
If we subtract 360 from 410, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 8:
90 goes into 500 5 times with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 7623.45
If we subtract 450 from 500, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 9:
If we divide 500 by 90, we get 5 and a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 7623.455
If we take 450 away from 500, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The quotient of the division is 7623.455, and the remainder is 0.005.