We look at the division of 629988 by 51 
The aim is to understand the frequency of 51 in 629988.

Moving on to step 1:
When dividing 6 by 51, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 51

Going ahead to step 2:
62 divided by 51 is 1 with a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 11 after subtracting 51 from 62.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 51

Moving on to step 3:
51 can be fit into 119 2 times, resulting in a remainder of 17.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtract 102 from 119 to get 17.
Fetch the next digit (9) from the dividend, attach it to 17 and continue: 179 / 51

Advancing to step 4:
When dividing 179 by 51, we get 3 with a remainder of 26.
Record the quotient 3 as the next digit in the result. 
Result so far: 123.0
If we subtract 153 from 179, we get 26.
Grab the next digit (8) from the dividend, add it to 26, then carry on: 268 / 51

Let's proceed to step 5:
268 divided by 51 is 5 with a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 1235.0
The remainder is 13 after subtracting 255 from 268.
Fetch the next digit (8) from the dividend, attach it to 13 and continue: 138 / 51

Advancing to step 6:
51 goes into 138 2 times with a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 12352.0
If we take 102 away from 138, we end up 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.

On to step 7:
360 divided by 51 is 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 12352.7
Subtracting 357 from 360 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 8:
The number 51 fits into 30 0 times, leaving a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 12352.7
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 9:
The number 51 fits into 300 5 times, leaving a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 12352.705
Subtracting 255 from 300 leaves us with 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 10:
51 goes into 450 8 times with a remainder of 42.
Write down 8 as next digit of the result. 
Result so far: 12352.7058
Deduct 408 from 450 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 11:
51 goes into 420 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 12352.70588
Subtract 408 from 420 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The quotient of the division is 12352.70588, and the remainder is 1.2e-05.