66398780 ÷ 696 
The aim is to understand the frequency of 696 in 66398780.

Step 1:
When dividing 6 by 696, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 696

Moving on to step 2:
696 goes into 66 0 times with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Append the next digit (3) from the dividend to 66 and continue with: 663 / 696

Advancing to step 3:
If we divide 663 by 696, we get 0 and a remainder of 663.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 663 to get 663.
Append the next digit (9) from the dividend to 663 and continue with: 6639 / 696

Step 4:
696 can be fit into 6639 9 times, resulting in a remainder of 375.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtract 6264 from 6639 to get 375.
Bring next digit (8) of the dividend behind the 375 and repeat the process: 3758 / 696

Advancing to step 5:
3758 divided by 696 is 5 with a remainder of 278.
The next digit of our result is 5. 
Result so far: 95.0
If we take 3480 away from 3758, we end up with 278.
Take the next digit (7) from the dividend and append it to 278, then repeat: 2787 / 696

Going ahead to step 6:
The number 696 fits into 2787 4 times, leaving a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 954.0
Deduct 2784 from 2787 and we're left with 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 696

Let's proceed to step 7:
When dividing 38 by 696, we get 0 with a remainder of 38.
The number 0 becomes the next digit in our result. 
Result so far: 9540.0
Deduct 0 from 38 and we're left with 38.
Fetch the next digit (0) from the dividend, attach it to 38 and continue: 380 / 696

Let's proceed to step 8:
696 can be fit into 380 0 times, resulting in a remainder of 380.
Put 0 as the next digit of the answer. 
Result so far: 95400.0
Subtract 0 from 380 to get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Step 9:
The number 696 fits into 3800 5 times, leaving a remainder of 320.
Put 5 as the next digit of the answer. 
Result so far: 95400.5
If we take 3480 away from 3800, we end up with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Let's proceed to step 10:
When dividing 3200 by 696, we get 4 with a remainder of 416.
The next digit of our result is 4. 
Result so far: 95400.54
Subtracting 2784 from 3200 leaves us with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Going ahead to step 11:
696 can be fit into 4160 5 times, resulting in a remainder of 680.
Record the quotient 5 as the next digit in the result. 
Result so far: 95400.545
The remainder is 680 after subtracting 3480 from 4160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Let's proceed to step 12:
The number 696 fits into 6800 9 times, leaving a remainder of 536.
The next digit of our result is 9. 
Result so far: 95400.5459
Deduct 6264 from 6800 and we're left with 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Step 13:
The number 696 fits into 5360 7 times, leaving a remainder of 488.
Write down 7 as next digit of the result. 
Result so far: 95400.54597
The remainder is 488 after subtracting 4872 from 5360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

Step 14:
696 can be fit into 4880 7 times, resulting in a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 95400.545977
Deduct 4872 from 4880 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The quotient of the division is 95400.545977, and the remainder is 8e-07.