We look at the division of 48761539 by 661 
The aim is to understand the frequency of 661 in 48761539.

Advancing to step 1:
If we divide 4 by 661, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 661

Step 2:
When dividing 48 by 661, we get 0 with a remainder of 48.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 48 after subtracting 0 from 48.
Append the next digit (7) from the dividend to 48 and continue with: 487 / 661

Going ahead to step 3:
If we divide 487 by 661, we get 0 and a remainder of 487.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 487 and we're left with 487.
Grab the next digit (6) from the dividend, add it to 487, then carry on: 4876 / 661

On to step 4:
4876 divided by 661 is 7 with a remainder of 249.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtract 4627 from 4876 to get 249.
Include the next digit (1) from the dividend after 249, then repeat: 2491 / 661

Advancing to step 5:
The number 661 fits into 2491 3 times, leaving a remainder of 508.
Put 3 as the next digit of the answer. 
Result so far: 73.0
If we take 1983 away from 2491, we end up with 508.
Grab the next digit (5) from the dividend, add it to 508, then carry on: 5085 / 661

Moving on to step 6:
661 can be fit into 5085 7 times, resulting in a remainder of 458.
Use 7 as the next digit of our solution. 
Result so far: 737.0
The remainder is 458 after subtracting 4627 from 5085.
Grab the next digit (3) from the dividend, add it to 458, then carry on: 4583 / 661

Advancing to step 7:
661 can be fit into 4583 6 times, resulting in a remainder of 617.
Put 6 as the next digit of the answer. 
Result so far: 7376.0
Subtracting 3966 from 4583 leaves us with 617.
Include the next digit (9) from the dividend after 617, then repeat: 6179 / 661

Let's proceed to step 8:
When dividing 6179 by 661, we get 9 with a remainder of 230.
The next digit of our result is 9. 
Result so far: 73769.0
If we subtract 5949 from 6179, we get 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Advancing to step 9:
2300 divided by 661 is 3 with a remainder of 317.
Put 3 as the next digit of the answer. 
Result so far: 73769.3
Subtract 1983 from 2300 to get 317.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Going ahead to step 10:
661 can be fit into 3170 4 times, resulting in a remainder of 526.
The number 4 becomes the next digit in our result. 
Result so far: 73769.34
Deduct 2644 from 3170 and we're left with 526.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5260, and continue the process.

On to step 11:
5260 divided by 661 is 7 with a remainder of 633.
Record the quotient 7 as the next digit in the result. 
Result so far: 73769.347
The remainder is 633 after subtracting 4627 from 5260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6330, and continue the process.

Let's proceed to step 12:
The number 661 fits into 6330 9 times, leaving a remainder of 381.
Use 9 as the next digit of our solution. 
Result so far: 73769.3479
If we subtract 5949 from 6330, we get 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

On to step 13:
661 can be fit into 3810 5 times, resulting in a remainder of 505.
The next digit of our result is 5. 
Result so far: 73769.34795
The remainder is 505 after subtracting 3305 from 3810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

Step 14:
The number 661 fits into 5050 7 times, leaving a remainder of 423.
Write down 7 as next digit of the result. 
Result so far: 73769.347957
Deduct 4627 from 5050 and we're left with 423.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4230, and continue the process.

Step 15:
The number 661 fits into 4230 6 times, leaving a remainder of 264.
Write down 6 as next digit of the result. 
Result so far: 73769.3479576
The remainder is 264 after subtracting 3966 from 4230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Let's proceed to step 16:
When dividing 2640 by 661, we get 3 with a remainder of 657.
The number 3 becomes the next digit in our result. 
Result so far: 73769.34795763
Subtract 1983 from 2640 to get 657.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6570, and continue the process.

The final outcome is 73769.34795763, with a leftover of 6.57e-07.