We're dividing 63996748 by 966 
The aim is to understand the frequency of 966 in 63996748.

Going ahead to step 1:
If we divide 6 by 966, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 966

On to step 2:
If we divide 63 by 966, we get 0 and a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Grab the next digit (9) from the dividend, add it to 63, then carry on: 639 / 966

On to step 3:
If we divide 639 by 966, we get 0 and a remainder of 639.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 639, we get 639.
Bring next digit (9) of the dividend behind the 639 and repeat the process: 6399 / 966

On to step 4:
The number 966 fits into 6399 6 times, leaving a remainder of 603.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 5796 away from 6399, we end up with 603.
Take the next digit (6) from the dividend and append it to 603, then repeat: 6036 / 966

Going ahead to step 5:
When dividing 6036 by 966, we get 6 with a remainder of 240.
Write down 6 as next digit of the result. 
Result so far: 66.0
The remainder is 240 after subtracting 5796 from 6036.
Fetch the next digit (7) from the dividend, attach it to 240 and continue: 2407 / 966

Advancing to step 6:
2407 divided by 966 is 2 with a remainder of 475.
Record the quotient 2 as the next digit in the result. 
Result so far: 662.0
If we take 1932 away from 2407, we end up with 475.
Take the next digit (4) from the dividend and append it to 475, then repeat: 4754 / 966

Step 7:
If we divide 4754 by 966, we get 4 and a remainder of 890.
Put 4 as the next digit of the answer. 
Result so far: 6624.0
If we take 3864 away from 4754, we end up with 890.
Grab the next digit (8) from the dividend, add it to 890, then carry on: 8908 / 966

Moving on to step 8:
966 goes into 8908 9 times with a remainder of 214.
The next digit of our result is 9. 
Result so far: 66249.0
If we take 8694 away from 8908, we end up with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Going ahead to step 9:
2140 divided by 966 is 2 with a remainder of 208.
The next digit of our result is 2. 
Result so far: 66249.2
Subtracting 1932 from 2140 leaves us with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

On to step 10:
When dividing 2080 by 966, we get 2 with a remainder of 148.
Write down 2 as next digit of the result. 
Result so far: 66249.22
If we take 1932 away from 2080, we end up with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

The quotient of the division is 66249.22, and the remainder is 0.148.