12511457 ÷ 786 
The aim is to understand the frequency of 786 in 12511457.

On to step 1:
786 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 786

Moving on to step 2:
When dividing 12 by 786, we get 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 786

Step 3:
786 goes into 125 0 times with a remainder of 125.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 125 after subtracting 0 from 125.
Grab the next digit (1) from the dividend, add it to 125, then carry on: 1251 / 786

Let's proceed to step 4:
The number 786 fits into 1251 1 times, leaving a remainder of 465.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 786 from 1251 and we're left with 465.
Fetch the next digit (1) from the dividend, attach it to 465 and continue: 4651 / 786

Moving on to step 5:
786 goes into 4651 5 times with a remainder of 721.
Put 5 as the next digit of the answer. 
Result so far: 15.0
If we take 3930 away from 4651, we end up with 721.
Grab the next digit (4) from the dividend, add it to 721, then carry on: 7214 / 786

Let's proceed to step 6:
7214 divided by 786 is 9 with a remainder of 140.
Record the quotient 9 as the next digit in the result. 
Result so far: 159.0
Subtracting 7074 from 7214 leaves us with 140.
Grab the next digit (5) from the dividend, add it to 140, then carry on: 1405 / 786

Step 7:
786 goes into 1405 1 times with a remainder of 619.
Use 1 as the next digit of our solution. 
Result so far: 1591.0
If we subtract 786 from 1405, we get 619.
Grab the next digit (7) from the dividend, add it to 619, then carry on: 6197 / 786

Going ahead to step 8:
If we divide 6197 by 786, we get 7 and a remainder of 695.
The number 7 becomes the next digit in our result. 
Result so far: 15917.0
If we subtract 5502 from 6197, we get 695.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6950, and continue the process.

Advancing to step 9:
786 goes into 6950 8 times with a remainder of 662.
Put 8 as the next digit of the answer. 
Result so far: 15917.8
Deduct 6288 from 6950 and we're left with 662.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6620, and continue the process.

Advancing to step 10:
786 can be fit into 6620 8 times, resulting in a remainder of 332.
Put 8 as the next digit of the answer. 
Result so far: 15917.88
If we take 6288 away from 6620, we end up with 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Our division results in 15917.88 with a remaining 0.332.