We look at the division of 61234396 by 510 
The aim is to understand the frequency of 510 in 61234396.

Advancing to step 1:
If we divide 6 by 510, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 510

Step 2:
The number 510 fits into 61 0 times, leaving a remainder of 61.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 61 and we're left with 61.
Bring next digit (2) of the dividend behind the 61 and repeat the process: 612 / 510

Let's proceed to step 3:
510 can be fit into 612 1 times, resulting in a remainder of 102.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 510 from 612 to get 102.
Grab the next digit (3) from the dividend, add it to 102, then carry on: 1023 / 510

Advancing to step 4:
510 can be fit into 1023 2 times, resulting in a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtract 1020 from 1023 to get 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 510

Going ahead to step 5:
If we divide 34 by 510, we get 0 and a remainder of 34.
The next digit of our result is 0. 
Result so far: 120.0
If we take 0 away from 34, we end up with 34.
Take the next digit (3) from the dividend and append it to 34, then repeat: 343 / 510

Step 6:
343 divided by 510 is 0 with a remainder of 343.
The next digit of our result is 0. 
Result so far: 1200.0
Deduct 0 from 343 and we're left with 343.
Take the next digit (9) from the dividend and append it to 343, then repeat: 3439 / 510

Going ahead to step 7:
510 goes into 3439 6 times with a remainder of 379.
The number 6 becomes the next digit in our result. 
Result so far: 12006.0
Subtract 3060 from 3439 to get 379.
Bring next digit (6) of the dividend behind the 379 and repeat the process: 3796 / 510

Step 8:
3796 divided by 510 is 7 with a remainder of 226.
Put 7 as the next digit of the answer. 
Result so far: 120067.0
Deduct 3570 from 3796 and we're left with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

On to step 9:
510 goes into 2260 4 times with a remainder of 220.
The number 4 becomes the next digit in our result. 
Result so far: 120067.4
If we subtract 2040 from 2260, we get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 10:
510 can be fit into 2200 4 times, resulting in a remainder of 160.
Write down 4 as next digit of the result. 
Result so far: 120067.44
Subtracting 2040 from 2200 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

The quotient of the division is 120067.44, and the remainder is 0.16.