We look at the division of 30972636 by 400 
The aim is to understand the frequency of 400 in 30972636.

Going ahead to step 1:
If we divide 3 by 400, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 400

On to step 2:
30 divided by 400 is 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 30, we end up with 30.
Take the next digit (9) from the dividend and append it to 30, then repeat: 309 / 400

Moving on to step 3:
The number 400 fits into 309 0 times, leaving a remainder of 309.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 309, we end up with 309.
Grab the next digit (7) from the dividend, add it to 309, then carry on: 3097 / 400

Moving on to step 4:
The number 400 fits into 3097 7 times, leaving a remainder of 297.
Use 7 as the next digit of our solution. 
Result so far: 7.0
If we take 2800 away from 3097, we end up with 297.
Include the next digit (2) from the dividend after 297, then repeat: 2972 / 400

Advancing to step 5:
The number 400 fits into 2972 7 times, leaving a remainder of 172.
The number 7 becomes the next digit in our result. 
Result so far: 77.0
Subtract 2800 from 2972 to get 172.
Take the next digit (6) from the dividend and append it to 172, then repeat: 1726 / 400

On to step 6:
When dividing 1726 by 400, we get 4 with a remainder of 126.
Write down 4 as next digit of the result. 
Result so far: 774.0
Subtract 1600 from 1726 to get 126.
Fetch the next digit (3) from the dividend, attach it to 126 and continue: 1263 / 400

Advancing to step 7:
The number 400 fits into 1263 3 times, leaving a remainder of 63.
The next digit of our result is 3. 
Result so far: 7743.0
Subtract 1200 from 1263 to get 63.
Bring next digit (6) of the dividend behind the 63 and repeat the process: 636 / 400

Going ahead to step 8:
The number 400 fits into 636 1 times, leaving a remainder of 236.
Record the quotient 1 as the next digit in the result. 
Result so far: 77431.0
If we take 400 away from 636, we end up with 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Going ahead to step 9:
2360 divided by 400 is 5 with a remainder of 360.
Write down 5 as next digit of the result. 
Result so far: 77431.5
Subtracting 2000 from 2360 leaves us with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Moving on to step 10:
When dividing 3600 by 400, we get 9 with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 77431.59
The remainder is 0 after subtracting 3600 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
The number 400 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 77431.59
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.

Step 12:
0 divided by 400 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 77431.59
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.

The final result is 77431.59 with a remainder of 0.0.