We divide 40335363 by 399
The aim is to understand the frequency of 399 in 40335363.

Advancing to step 1:
399 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 399

On to step 2:
If we divide 40 by 399, we get 0 and a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 40 leaves us with 40.
Bring next digit (3) of the dividend behind the 40 and repeat the process: 403 / 399

On to step 3:
403 divided by 399 is 1 with a remainder of 4.
The next digit of our result is 1. 
Result so far: 1.0
If we take 399 away from 403, we end up with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 399

Going ahead to step 4:
The number 399 fits into 43 0 times, leaving a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 10.0
The remainder is 43 after subtracting 0 from 43.
Append the next digit (5) from the dividend to 43 and continue with: 435 / 399

Going ahead to step 5:
If we divide 435 by 399, we get 1 and a remainder of 36.
Write down 1 as next digit of the result. 
Result so far: 101.0
Deduct 399 from 435 and we're left with 36.
Bring next digit (3) of the dividend behind the 36 and repeat the process: 363 / 399

Advancing to step 6:
363 divided by 399 is 0 with a remainder of 363.
The next digit of our result is 0. 
Result so far: 1010.0
If we take 0 away from 363, we end up with 363.
Fetch the next digit (6) from the dividend, attach it to 363 and continue: 3636 / 399

Advancing to step 7:
399 goes into 3636 9 times with a remainder of 45.
The next digit of our result is 9. 
Result so far: 10109.0
Deduct 3591 from 3636 and we're left with 45.
Grab the next digit (3) from the dividend, add it to 45, then carry on: 453 / 399

Let's proceed to step 8:
399 goes into 453 1 times with a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 101091.0
Deduct 399 from 453 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 9:
540 divided by 399 is 1 with a remainder of 141.
The number 1 becomes the next digit in our result. 
Result so far: 101091.1
If we take 399 away from 540, we end up with 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

On to step 10:
The number 399 fits into 1410 3 times, leaving a remainder of 213.
The number 3 becomes the next digit in our result. 
Result so far: 101091.13
If we take 1197 away from 1410, we end up with 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Step 11:
399 goes into 2130 5 times with a remainder of 135.
The number 5 becomes the next digit in our result. 
Result so far: 101091.135
The remainder is 135 after subtracting 1995 from 2130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Moving on to step 12:
1350 divided by 399 is 3 with a remainder of 153.
The next digit of our result is 3. 
Result so far: 101091.1353
Subtract 1197 from 1350 to get 153.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

Step 13:
399 can be fit into 1530 3 times, resulting in a remainder of 333.
Record the quotient 3 as the next digit in the result. 
Result so far: 101091.13533
The remainder is 333 after subtracting 1197 from 1530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3330, and continue the process.

After the division, we end up with 101091.13533 and a remainder of 0.000333.