624978 divided by 90 
The aim is to understand the frequency of 90 in 624978.

Moving on to step 1:
6 divided by 90 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 90

Advancing to step 2:
90 can be fit into 62 0 times, resulting in a remainder of 62.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 62 to get 62.
Fetch the next digit (4) from the dividend, attach it to 62 and continue: 624 / 90

Going ahead to step 3:
624 divided by 90 is 6 with a remainder of 84.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtract 540 from 624 to get 84.
Take the next digit (9) from the dividend and append it to 84, then repeat: 849 / 90

Moving on to step 4:
90 goes into 849 9 times with a remainder of 39.
The next digit of our result is 9. 
Result so far: 69.0
Subtract 810 from 849 to get 39.
Fetch the next digit (7) from the dividend, attach it to 39 and continue: 397 / 90

Step 5:
The number 90 fits into 397 4 times, leaving a remainder of 37.
Put 4 as the next digit of the answer. 
Result so far: 694.0
Subtract 360 from 397 to get 37.
Fetch the next digit (8) from the dividend, attach it to 37 and continue: 378 / 90

Let's proceed to step 6:
378 divided by 90 is 4 with a remainder of 18.
Put 4 as the next digit of the answer. 
Result so far: 6944.0
If we take 360 away from 378, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
The number 90 fits into 180 2 times, leaving a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 6944.2
Subtract 180 from 180 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
0 divided by 90 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 6944.2
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
0 divided by 90 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6944.2
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 6944.2 with a remaining 0.0.