We're dividing 2015391 by 168 
The aim is to understand the frequency of 168 in 2015391.

Going ahead to step 1:
If we divide 2 by 168, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 168

Step 2:
If we divide 20 by 168, we get 0 and a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 20 after subtracting 0 from 20.
Append the next digit (1) from the dividend to 20 and continue with: 201 / 168

On to step 3:
201 divided by 168 is 1 with a remainder of 33.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 168 from 201 to get 33.
Take the next digit (5) from the dividend and append it to 33, then repeat: 335 / 168

Moving on to step 4:
168 goes into 335 1 times with a remainder of 167.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Deduct 168 from 335 and we're left with 167.
Append the next digit (3) from the dividend to 167 and continue with: 1673 / 168

Step 5:
When dividing 1673 by 168, we get 9 with a remainder of 161.
Put 9 as the next digit of the answer. 
Result so far: 119.0
Subtracting 1512 from 1673 leaves us with 161.
Include the next digit (9) from the dividend after 161, then repeat: 1619 / 168

On to step 6:
If we divide 1619 by 168, we get 9 and a remainder of 107.
The number 9 becomes the next digit in our result. 
Result so far: 1199.0
Deduct 1512 from 1619 and we're left with 107.
Grab the next digit (1) from the dividend, add it to 107, then carry on: 1071 / 168

Step 7:
If we divide 1071 by 168, we get 6 and a remainder of 63.
The number 6 becomes the next digit in our result. 
Result so far: 11996.0
The remainder is 63 after subtracting 1008 from 1071.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 8:
168 goes into 630 3 times with a remainder of 126.
Record the quotient 3 as the next digit in the result. 
Result so far: 11996.3
Deduct 504 from 630 and we're left with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Going ahead to step 9:
168 can be fit into 1260 7 times, resulting in a remainder of 84.
The next digit of our result is 7. 
Result so far: 11996.37
Deduct 1176 from 1260 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Step 10:
When dividing 840 by 168, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 11996.375
Subtract 840 from 840 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.

Advancing to step 11:
If we divide 0 by 168, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 11996.375
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.

Moving on to step 12:
168 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 11996.375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 11996.375 with a remaining 0.0.