155185 ÷ 72 
The aim is to understand the frequency of 72 in 155185.

Step 1:
The number 72 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 72

Let's proceed to step 2:
72 can be fit into 15 0 times, resulting in a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Grab the next digit (5) from the dividend, add it to 15, then carry on: 155 / 72

Let's proceed to step 3:
If we divide 155 by 72, we get 2 and a remainder of 11.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 11 after subtracting 144 from 155.
Bring next digit (1) of the dividend behind the 11 and repeat the process: 111 / 72

Going ahead to step 4:
When dividing 111 by 72, we get 1 with a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 21.0
The remainder is 39 after subtracting 72 from 111.
Append the next digit (8) from the dividend to 39 and continue with: 398 / 72

Advancing to step 5:
398 divided by 72 is 5 with a remainder of 38.
Write down 5 as next digit of the result. 
Result so far: 215.0
Subtract 360 from 398 to get 38.
Fetch the next digit (5) from the dividend, attach it to 38 and continue: 385 / 72

Let's proceed to step 6:
If we divide 385 by 72, we get 5 and a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 2155.0
If we take 360 away from 385, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 7:
When dividing 250 by 72, we get 3 with a remainder of 34.
Record the quotient 3 as the next digit in the result. 
Result so far: 2155.3
Subtract 216 from 250 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 8:
72 goes into 340 4 times with a remainder of 52.
Use 4 as the next digit of our solution. 
Result so far: 2155.34
If we subtract 288 from 340, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 9:
72 can be fit into 520 7 times, resulting in a remainder of 16.
Put 7 as the next digit of the answer. 
Result so far: 2155.347
Subtracting 504 from 520 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 10:
72 goes into 160 2 times with a remainder of 16.
The next digit of our result is 2. 
Result so far: 2155.3472
The remainder is 16 after subtracting 144 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 11:
72 can be fit into 160 2 times, resulting in a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 2155.34722
Subtract 144 from 160 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 2155.34722 and a remainder of 1.6e-05.