402856 ÷ 90 
The aim is to understand the frequency of 90 in 402856.

Step 1:
90 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 90

Going ahead to step 2:
When dividing 40 by 90, we get 0 with a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 40 and we're left with 40.
Bring next digit (2) of the dividend behind the 40 and repeat the process: 402 / 90

Going ahead to step 3:
402 divided by 90 is 4 with a remainder of 42.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 360 from 402 leaves us with 42.
Fetch the next digit (8) from the dividend, attach it to 42 and continue: 428 / 90

Going ahead to step 4:
90 goes into 428 4 times with a remainder of 68.
Put 4 as the next digit of the answer. 
Result so far: 44.0
Deduct 360 from 428 and we're left with 68.
Append the next digit (5) from the dividend to 68 and continue with: 685 / 90

Advancing to step 5:
The number 90 fits into 685 7 times, leaving a remainder of 55.
The number 7 becomes the next digit in our result. 
Result so far: 447.0
If we take 630 away from 685, we end up with 55.
Append the next digit (6) from the dividend to 55 and continue with: 556 / 90

Let's proceed to step 6:
556 divided by 90 is 6 with a remainder of 16.
The next digit of our result is 6. 
Result so far: 4476.0
Subtracting 540 from 556 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 7:
90 can be fit into 160 1 times, resulting in a remainder of 70.
Write down 1 as next digit of the result. 
Result so far: 4476.1
Deduct 90 from 160 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 8:
If we divide 700 by 90, we get 7 and a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 4476.17
Subtracting 630 from 700 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 9:
When dividing 700 by 90, we get 7 with a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 4476.177
If we subtract 630 from 700, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

In conclusion, the division gives 4476.177 with a balance of 0.007.