18394845 ÷ 391 
The aim is to understand the frequency of 391 in 18394845.

Advancing to step 1:
391 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 391

Let's proceed to step 2:
391 goes into 18 0 times with a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 18 and we're left with 18.
Take the next digit (3) from the dividend and append it to 18, then repeat: 183 / 391

Step 3:
If we divide 183 by 391, we get 0 and a remainder of 183.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 183 after subtracting 0 from 183.
Append the next digit (9) from the dividend to 183 and continue with: 1839 / 391

Step 4:
391 can be fit into 1839 4 times, resulting in a remainder of 275.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 1564 away from 1839, we end up with 275.
Fetch the next digit (4) from the dividend, attach it to 275 and continue: 2754 / 391

Going ahead to step 5:
If we divide 2754 by 391, we get 7 and a remainder of 17.
Record the quotient 7 as the next digit in the result. 
Result so far: 47.0
Deduct 2737 from 2754 and we're left with 17.
Take the next digit (8) from the dividend and append it to 17, then repeat: 178 / 391

Going ahead to step 6:
If we divide 178 by 391, we get 0 and a remainder of 178.
Put 0 as the next digit of the answer. 
Result so far: 470.0
Deduct 0 from 178 and we're left with 178.
Bring next digit (4) of the dividend behind the 178 and repeat the process: 1784 / 391

Advancing to step 7:
391 can be fit into 1784 4 times, resulting in a remainder of 220.
Write down 4 as next digit of the result. 
Result so far: 4704.0
Subtract 1564 from 1784 to get 220.
Include the next digit (5) from the dividend after 220, then repeat: 2205 / 391

Step 8:
391 can be fit into 2205 5 times, resulting in a remainder of 250.
Record the quotient 5 as the next digit in the result. 
Result so far: 47045.0
Subtract 1955 from 2205 to get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Step 9:
If we divide 2500 by 391, we get 6 and a remainder of 154.
Record the quotient 6 as the next digit in the result. 
Result so far: 47045.6
Deduct 2346 from 2500 and we're left with 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Advancing to step 10:
391 goes into 1540 3 times with a remainder of 367.
Put 3 as the next digit of the answer. 
Result so far: 47045.63
Subtract 1173 from 1540 to get 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Advancing to step 11:
391 can be fit into 3670 9 times, resulting in a remainder of 151.
Put 9 as the next digit of the answer. 
Result so far: 47045.639
Subtracting 3519 from 3670 leaves us with 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Moving on to step 12:
1510 divided by 391 is 3 with a remainder of 337.
Put 3 as the next digit of the answer. 
Result so far: 47045.6393
If we subtract 1173 from 1510, we get 337.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3370, and continue the process.

Going ahead to step 13:
391 can be fit into 3370 8 times, resulting in a remainder of 242.
Write down 8 as next digit of the result. 
Result so far: 47045.63938
Subtract 3128 from 3370 to get 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Let's proceed to step 14:
391 goes into 2420 6 times with a remainder of 74.
The next digit of our result is 6. 
Result so far: 47045.639386
If we subtract 2346 from 2420, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 15:
391 can be fit into 740 1 times, resulting in a remainder of 349.
Record the quotient 1 as the next digit in the result. 
Result so far: 47045.6393861
If we take 391 away from 740, we end up with 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Step 16:
391 can be fit into 3490 8 times, resulting in a remainder of 362.
Write down 8 as next digit of the result. 
Result so far: 47045.63938618
If we subtract 3128 from 3490, we get 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

The final outcome is 47045.63938618, with a leftover of 3.62e-07.