59453551 divided by 399 
The aim is to understand the frequency of 399 in 59453551.

On to step 1:
The number 399 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 399

Moving on to step 2:
399 goes into 59 0 times with a remainder of 59.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 59, we end up with 59.
Append the next digit (4) from the dividend to 59 and continue with: 594 / 399

On to step 3:
399 goes into 594 1 times with a remainder of 195.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 399 from 594, we get 195.
Fetch the next digit (5) from the dividend, attach it to 195 and continue: 1955 / 399

Going ahead to step 4:
The number 399 fits into 1955 4 times, leaving a remainder of 359.
The next digit of our result is 4. 
Result so far: 14.0
Subtract 1596 from 1955 to get 359.
Bring next digit (3) of the dividend behind the 359 and repeat the process: 3593 / 399

Moving on to step 5:
399 can be fit into 3593 9 times, resulting in a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 149.0
The remainder is 2 after subtracting 3591 from 3593.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 399

On to step 6:
399 goes into 25 0 times with a remainder of 25.
Use 0 as the next digit of our solution. 
Result so far: 1490.0
Subtracting 0 from 25 leaves us with 25.
Grab the next digit (5) from the dividend, add it to 25, then carry on: 255 / 399

On to step 7:
255 divided by 399 is 0 with a remainder of 255.
Use 0 as the next digit of our solution. 
Result so far: 14900.0
Subtract 0 from 255 to get 255.
Include the next digit (1) from the dividend after 255, then repeat: 2551 / 399

Let's proceed to step 8:
If we divide 2551 by 399, we get 6 and a remainder of 157.
Write down 6 as next digit of the result. 
Result so far: 149006.0
If we take 2394 away from 2551, we end up with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

Moving on to step 9:
399 can be fit into 1570 3 times, resulting in a remainder of 373.
Put 3 as the next digit of the answer. 
Result so far: 149006.3
Subtract 1197 from 1570 to get 373.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3730, and continue the process.

Going ahead to step 10:
399 goes into 3730 9 times with a remainder of 139.
Put 9 as the next digit of the answer. 
Result so far: 149006.39
If we take 3591 away from 3730, we end up with 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

Let's proceed to step 11:
The number 399 fits into 1390 3 times, leaving a remainder of 193.
Write down 3 as next digit of the result. 
Result so far: 149006.393
Deduct 1197 from 1390 and we're left with 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Let's proceed to step 12:
1930 divided by 399 is 4 with a remainder of 334.
Use 4 as the next digit of our solution. 
Result so far: 149006.3934
If we subtract 1596 from 1930, we get 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Moving on to step 13:
The number 399 fits into 3340 8 times, leaving a remainder of 148.
Use 8 as the next digit of our solution. 
Result so far: 149006.39348
If we subtract 3192 from 3340, we get 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Let's proceed to step 14:
1480 divided by 399 is 3 with a remainder of 283.
The number 3 becomes the next digit in our result. 
Result so far: 149006.393483
If we subtract 1197 from 1480, we get 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

Moving on to step 15:
399 goes into 2830 7 times with a remainder of 37.
Use 7 as the next digit of our solution. 
Result so far: 149006.3934837
Deduct 2793 from 2830 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 16:
399 can be fit into 370 0 times, resulting in a remainder of 370.
Use 0 as the next digit of our solution. 
Result so far: 149006.3934837
If we take 0 away from 370, we end up with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

The quotient of the division is 149006.3934837, and the remainder is 3.7e-07.