724320 ÷ 90 
The aim is to understand the frequency of 90 in 724320.

Step 1:
When dividing 7 by 90, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 90

Advancing to step 2:
When dividing 72 by 90, we get 0 with a remainder of 72.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 72, we get 72.
Grab the next digit (4) from the dividend, add it to 72, then carry on: 724 / 90

Advancing to step 3:
90 can be fit into 724 8 times, resulting in a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtracting 720 from 724 leaves us with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 90

Advancing to step 4:
If we divide 43 by 90, we get 0 and a remainder of 43.
Write down 0 as next digit of the result. 
Result so far: 80.0
If we take 0 away from 43, we end up with 43.
Take the next digit (2) from the dividend and append it to 43, then repeat: 432 / 90

Moving on to step 5:
When dividing 432 by 90, we get 4 with a remainder of 72.
Write down 4 as next digit of the result. 
Result so far: 804.0
If we subtract 360 from 432, we get 72.
Take the next digit (0) from the dividend and append it to 72, then repeat: 720 / 90

Advancing to step 6:
720 divided by 90 is 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 8048.0
If we take 720 away from 720, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
0 divided by 90 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8048.0
Subtract 0 from 0 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.

Let's proceed to step 8:
When dividing 0 by 90, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8048.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 8048.0 with a remainder of 0.0.