We're dividing 83665401 by 961 
The aim is to understand the frequency of 961 in 83665401.

On to step 1:
The number 961 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 961

On to step 2:
If we divide 83 by 961, we get 0 and a remainder of 83.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 83 and we're left with 83.
Fetch the next digit (6) from the dividend, attach it to 83 and continue: 836 / 961

Advancing to step 3:
The number 961 fits into 836 0 times, leaving a remainder of 836.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 836, we end up with 836.
Append the next digit (6) from the dividend to 836 and continue with: 8366 / 961

Moving on to step 4:
The number 961 fits into 8366 8 times, leaving a remainder of 678.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtracting 7688 from 8366 leaves us with 678.
Append the next digit (5) from the dividend to 678 and continue with: 6785 / 961

Let's proceed to step 5:
If we divide 6785 by 961, we get 7 and a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 87.0
The remainder is 58 after subtracting 6727 from 6785.
Take the next digit (4) from the dividend and append it to 58, then repeat: 584 / 961

Step 6:
When dividing 584 by 961, we get 0 with a remainder of 584.
Put 0 as the next digit of the answer. 
Result so far: 870.0
Subtracting 0 from 584 leaves us with 584.
Grab the next digit (0) from the dividend, add it to 584, then carry on: 5840 / 961

Advancing to step 7:
The number 961 fits into 5840 6 times, leaving a remainder of 74.
Use 6 as the next digit of our solution. 
Result so far: 8706.0
If we take 5766 away from 5840, we end up with 74.
Grab the next digit (1) from the dividend, add it to 74, then carry on: 741 / 961

Moving on to step 8:
When dividing 741 by 961, we get 0 with a remainder of 741.
Use 0 as the next digit of our solution. 
Result so far: 87060.0
If we subtract 0 from 741, we get 741.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7410, and continue the process.

Moving on to step 9:
When dividing 7410 by 961, we get 7 with a remainder of 683.
The number 7 becomes the next digit in our result. 
Result so far: 87060.7
Subtract 6727 from 7410 to get 683.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6830, and continue the process.

Let's proceed to step 10:
961 goes into 6830 7 times with a remainder of 103.
Put 7 as the next digit of the answer. 
Result so far: 87060.77
The remainder is 103 after subtracting 6727 from 6830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

The quotient of the division is 87060.77, and the remainder is 0.103.