673719 divided by 51 
The aim is to understand the frequency of 51 in 673719.

On to step 1:
6 divided by 51 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (7) from the dividend after 6, then repeat: 67 / 51

Step 2:
If we divide 67 by 51, we get 1 and a remainder of 16.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 51 away from 67, we end up with 16.
Include the next digit (3) from the dividend after 16, then repeat: 163 / 51

Going ahead to step 3:
163 divided by 51 is 3 with a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
If we take 153 away from 163, we end up with 10.
Fetch the next digit (7) from the dividend, attach it to 10 and continue: 107 / 51

On to step 4:
When dividing 107 by 51, we get 2 with a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 132.0
If we take 102 away from 107, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 51

Step 5:
If we divide 51 by 51, we get 1 and a remainder of 0.
The next digit of our result is 1. 
Result so far: 1321.0
Deduct 51 from 51 and we're left with 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 51

On to step 6:
9 divided by 51 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 13210.0
Deduct 0 from 9 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
90 divided by 51 is 1 with a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 13210.1
The remainder is 39 after subtracting 51 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 8:
If we divide 390 by 51, we get 7 and a remainder of 33.
Put 7 as the next digit of the answer. 
Result so far: 13210.17
Subtract 357 from 390 to get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 9:
330 divided by 51 is 6 with a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 13210.176
If we take 306 away from 330, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 10:
The number 51 fits into 240 4 times, leaving a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 13210.1764
Deduct 204 from 240 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 11:
51 goes into 360 7 times with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 13210.17647
The remainder is 3 after subtracting 357 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 12:
51 goes into 30 0 times with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 13210.17647
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 13:
51 goes into 300 5 times with a remainder of 45.
The next digit of our result is 5. 
Result so far: 13210.1764705
If we subtract 255 from 300, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 14:
The number 51 fits into 450 8 times, leaving a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 13210.17647058
The remainder is 42 after subtracting 408 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

After the division, we end up with 13210.17647058 and a remainder of 4.2e-08.