We divide 51513789 by 687
The aim is to understand the frequency of 687 in 51513789.

On to step 1:
5 divided by 687 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 687

Let's proceed to step 2:
687 can be fit into 51 0 times, resulting in a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Fetch the next digit (5) from the dividend, attach it to 51 and continue: 515 / 687

On to step 3:
687 can be fit into 515 0 times, resulting in a remainder of 515.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 515 leaves us with 515.
Append the next digit (1) from the dividend to 515 and continue with: 5151 / 687

On to step 4:
687 can be fit into 5151 7 times, resulting in a remainder of 342.
The next digit of our result is 7. 
Result so far: 7.0
If we subtract 4809 from 5151, we get 342.
Append the next digit (3) from the dividend to 342 and continue with: 3423 / 687

Let's proceed to step 5:
687 can be fit into 3423 4 times, resulting in a remainder of 675.
Use 4 as the next digit of our solution. 
Result so far: 74.0
Subtract 2748 from 3423 to get 675.
Bring next digit (7) of the dividend behind the 675 and repeat the process: 6757 / 687

Advancing to step 6:
687 can be fit into 6757 9 times, resulting in a remainder of 574.
Write down 9 as next digit of the result. 
Result so far: 749.0
If we subtract 6183 from 6757, we get 574.
Append the next digit (8) from the dividend to 574 and continue with: 5748 / 687

Advancing to step 7:
687 can be fit into 5748 8 times, resulting in a remainder of 252.
The next digit of our result is 8. 
Result so far: 7498.0
Subtracting 5496 from 5748 leaves us with 252.
Append the next digit (9) from the dividend to 252 and continue with: 2529 / 687

On to step 8:
2529 divided by 687 is 3 with a remainder of 468.
Write down 3 as next digit of the result. 
Result so far: 74983.0
If we subtract 2061 from 2529, we get 468.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4680, and continue the process.

Moving on to step 9:
687 can be fit into 4680 6 times, resulting in a remainder of 558.
The number 6 becomes the next digit in our result. 
Result so far: 74983.6
Deduct 4122 from 4680 and we're left with 558.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

Let's proceed to step 10:
If we divide 5580 by 687, we get 8 and a remainder of 84.
Use 8 as the next digit of our solution. 
Result so far: 74983.68
The remainder is 84 after subtracting 5496 from 5580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

On to step 11:
840 divided by 687 is 1 with a remainder of 153.
The number 1 becomes the next digit in our result. 
Result so far: 74983.681
The remainder is 153 after subtracting 687 from 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

Going ahead to step 12:
1530 divided by 687 is 2 with a remainder of 156.
Record the quotient 2 as the next digit in the result. 
Result so far: 74983.6812
The remainder is 156 after subtracting 1374 from 1530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Let's proceed to step 13:
The number 687 fits into 1560 2 times, leaving a remainder of 186.
The number 2 becomes the next digit in our result. 
Result so far: 74983.68122
Deduct 1374 from 1560 and we're left with 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

After the division, we end up with 74983.68122 and a remainder of 0.000186.