Let's divide 723147 by 90
The aim is to understand the frequency of 90 in 723147.

Step 1:
If we divide 7 by 90, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 90

Moving on to step 2:
72 divided by 90 is 0 with a remainder of 72.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Grab the next digit (3) from the dividend, add it to 72, then carry on: 723 / 90

Step 3:
The number 90 fits into 723 8 times, leaving a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtract 720 from 723 to get 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 90

On to step 4:
31 divided by 90 is 0 with a remainder of 31.
Write down 0 as next digit of the result. 
Result so far: 80.0
Subtract 0 from 31 to get 31.
Take the next digit (4) from the dividend and append it to 31, then repeat: 314 / 90

Step 5:
314 divided by 90 is 3 with a remainder of 44.
Record the quotient 3 as the next digit in the result. 
Result so far: 803.0
If we subtract 270 from 314, we get 44.
Take the next digit (7) from the dividend and append it to 44, then repeat: 447 / 90

Going ahead to step 6:
447 divided by 90 is 4 with a remainder of 87.
The number 4 becomes the next digit in our result. 
Result so far: 8034.0
Subtracting 360 from 447 leaves us with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 7:
If we divide 870 by 90, we get 9 and a remainder of 60.
The next digit of our result is 9. 
Result so far: 8034.9
Deduct 810 from 870 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 8:
If we divide 600 by 90, we get 6 and a remainder of 60.
Write down 6 as next digit of the result. 
Result so far: 8034.96
If we take 540 away from 600, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
The next digit of our result is 6. 
Result so far: 8034.966
Subtract 540 from 600 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The quotient of the division is 8034.966, and the remainder is 0.006.