We divide 142793 by 90
The aim is to understand the frequency of 90 in 142793.

Step 1:
1 divided by 90 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 90

Step 2:
If we divide 14 by 90, we get 0 and a remainder of 14.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 14, we end up with 14.
Append the next digit (2) from the dividend to 14 and continue with: 142 / 90

On to step 3:
The number 90 fits into 142 1 times, leaving a remainder of 52.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 90 away from 142, we end up with 52.
Include the next digit (7) from the dividend after 52, then repeat: 527 / 90

Advancing to step 4:
If we divide 527 by 90, we get 5 and a remainder of 77.
Put 5 as the next digit of the answer. 
Result so far: 15.0
If we take 450 away from 527, we end up with 77.
Include the next digit (9) from the dividend after 77, then repeat: 779 / 90

Moving on to step 5:
If we divide 779 by 90, we get 8 and a remainder of 59.
The number 8 becomes the next digit in our result. 
Result so far: 158.0
If we take 720 away from 779, we end up with 59.
Fetch the next digit (3) from the dividend, attach it to 59 and continue: 593 / 90

Moving on to step 6:
When dividing 593 by 90, we get 6 with a remainder of 53.
The number 6 becomes the next digit in our result. 
Result so far: 1586.0
If we take 540 away from 593, we end up with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 7:
The number 90 fits into 530 5 times, leaving a remainder of 80.
Record the quotient 5 as the next digit in the result. 
Result so far: 1586.5
The remainder is 80 after subtracting 450 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 8:
90 goes into 800 8 times with a remainder of 80.
The number 8 becomes the next digit in our result. 
Result so far: 1586.58
Subtracting 720 from 800 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 9:
800 divided by 90 is 8 with a remainder of 80.
The next digit of our result is 8. 
Result so far: 1586.588
Subtracting 720 from 800 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The quotient of the division is 1586.588, and the remainder is 0.008.