We're dividing 51207661 by 961 
The aim is to understand the frequency of 961 in 51207661.

Going ahead to step 1:
961 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 961

Step 2:
The number 961 fits into 51 0 times, leaving a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Bring next digit (2) of the dividend behind the 51 and repeat the process: 512 / 961

Let's proceed to step 3:
If we divide 512 by 961, we get 0 and a remainder of 512.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 512, we end up with 512.
Take the next digit (0) from the dividend and append it to 512, then repeat: 5120 / 961

On to step 4:
The number 961 fits into 5120 5 times, leaving a remainder of 315.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 4805 from 5120 leaves us with 315.
Append the next digit (7) from the dividend to 315 and continue with: 3157 / 961

Step 5:
3157 divided by 961 is 3 with a remainder of 274.
Put 3 as the next digit of the answer. 
Result so far: 53.0
If we subtract 2883 from 3157, we get 274.
Bring next digit (6) of the dividend behind the 274 and repeat the process: 2746 / 961

Let's proceed to step 6:
When dividing 2746 by 961, we get 2 with a remainder of 824.
Put 2 as the next digit of the answer. 
Result so far: 532.0
The remainder is 824 after subtracting 1922 from 2746.
Append the next digit (6) from the dividend to 824 and continue with: 8246 / 961

On to step 7:
8246 divided by 961 is 8 with a remainder of 558.
Write down 8 as next digit of the result. 
Result so far: 5328.0
Subtracting 7688 from 8246 leaves us with 558.
Grab the next digit (1) from the dividend, add it to 558, then carry on: 5581 / 961

Let's proceed to step 8:
5581 divided by 961 is 5 with a remainder of 776.
The number 5 becomes the next digit in our result. 
Result so far: 53285.0
Deduct 4805 from 5581 and we're left with 776.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7760, and continue the process.

Moving on to step 9:
7760 divided by 961 is 8 with a remainder of 72.
Put 8 as the next digit of the answer. 
Result so far: 53285.8
If we subtract 7688 from 7760, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 10:
If we divide 720 by 961, we get 0 and a remainder of 720.
The next digit of our result is 0. 
Result so far: 53285.8
Deduct 0 from 720 and we're left with 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7200, and continue the process.

Going ahead to step 11:
The number 961 fits into 7200 7 times, leaving a remainder of 473.
The next digit of our result is 7. 
Result so far: 53285.807
If we subtract 6727 from 7200, we get 473.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4730, and continue the process.

On to step 12:
If we divide 4730 by 961, we get 4 and a remainder of 886.
The number 4 becomes the next digit in our result. 
Result so far: 53285.8074
If we subtract 3844 from 4730, we get 886.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8860, and continue the process.

Moving on to step 13:
8860 divided by 961 is 9 with a remainder of 211.
Use 9 as the next digit of our solution. 
Result so far: 53285.80749
Subtract 8649 from 8860 to get 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Advancing to step 14:
When dividing 2110 by 961, we get 2 with a remainder of 188.
The next digit of our result is 2. 
Result so far: 53285.807492
Deduct 1922 from 2110 and we're left with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 15:
961 goes into 1880 1 times with a remainder of 919.
The next digit of our result is 1. 
Result so far: 53285.8074921
Subtract 961 from 1880 to get 919.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9190, and continue the process.

Going ahead to step 16:
961 can be fit into 9190 9 times, resulting in a remainder of 541.
The next digit of our result is 9. 
Result so far: 53285.80749219
If we take 8649 away from 9190, we end up with 541.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5410, and continue the process.

The final result is 53285.80749219 with a remainder of 5.41e-07.