90951 divided by 66 
The aim is to understand the frequency of 66 in 90951.

On to step 1:
9 divided by 66 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 66

Moving on to step 2:
90 divided by 66 is 1 with a remainder of 24.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 66 from 90 and we're left with 24.
Take the next digit (9) from the dividend and append it to 24, then repeat: 249 / 66

Step 3:
When dividing 249 by 66, we get 3 with a remainder of 51.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 198 from 249, we get 51.
Grab the next digit (5) from the dividend, add it to 51, then carry on: 515 / 66

Moving on to step 4:
66 goes into 515 7 times with a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 137.0
Subtract 462 from 515 to get 53.
Append the next digit (1) from the dividend to 53 and continue with: 531 / 66

Let's proceed to step 5:
531 divided by 66 is 8 with a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 1378.0
Subtracting 528 from 531 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 6:
66 can be fit into 30 0 times, resulting in a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 1378.0
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 7:
66 goes into 300 4 times with a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 1378.04
If we subtract 264 from 300, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 8:
360 divided by 66 is 5 with a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 1378.045
Subtracting 330 from 360 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 9:
300 divided by 66 is 4 with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 1378.0454
If we subtract 264 from 300, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 10:
When dividing 360 by 66, we get 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 1378.04545
If we take 330 away from 360, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 11:
If we divide 300 by 66, we get 4 and a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 1378.045454
Subtracting 264 from 300 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 12:
If we divide 360 by 66, we get 5 and a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 1378.0454545
If we subtract 330 from 360, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 13:
The number 66 fits into 300 4 times, leaving a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 1378.04545454
Subtracting 264 from 300 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The quotient of the division is 1378.04545454, and the remainder is 3.6e-08.