We look at the division of 66066766 by 400 
The aim is to understand the frequency of 400 in 66066766.

Step 1:
When dividing 6 by 400, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 400

Moving on to step 2:
The number 400 fits into 66 0 times, leaving a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Grab the next digit (0) from the dividend, add it to 66, then carry on: 660 / 400

Moving on to step 3:
If we divide 660 by 400, we get 1 and a remainder of 260.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 260 after subtracting 400 from 660.
Grab the next digit (6) from the dividend, add it to 260, then carry on: 2606 / 400

Let's proceed to step 4:
If we divide 2606 by 400, we get 6 and a remainder of 206.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtract 2400 from 2606 to get 206.
Take the next digit (6) from the dividend and append it to 206, then repeat: 2066 / 400

On to step 5:
The number 400 fits into 2066 5 times, leaving a remainder of 66.
Use 5 as the next digit of our solution. 
Result so far: 165.0
The remainder is 66 after subtracting 2000 from 2066.
Grab the next digit (7) from the dividend, add it to 66, then carry on: 667 / 400

Going ahead to step 6:
If we divide 667 by 400, we get 1 and a remainder of 267.
The next digit of our result is 1. 
Result so far: 1651.0
Deduct 400 from 667 and we're left with 267.
Include the next digit (6) from the dividend after 267, then repeat: 2676 / 400

Step 7:
When dividing 2676 by 400, we get 6 with a remainder of 276.
Put 6 as the next digit of the answer. 
Result so far: 16516.0
If we take 2400 away from 2676, we end up with 276.
Append the next digit (6) from the dividend to 276 and continue with: 2766 / 400

On to step 8:
When dividing 2766 by 400, we get 6 with a remainder of 366.
Record the quotient 6 as the next digit in the result. 
Result so far: 165166.0
The remainder is 366 after subtracting 2400 from 2766.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Moving on to step 9:
If we divide 3660 by 400, we get 9 and a remainder of 60.
The next digit of our result is 9. 
Result so far: 165166.9
The remainder is 60 after subtracting 3600 from 3660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 10:
600 divided by 400 is 1 with a remainder of 200.
Record the quotient 1 as the next digit in the result. 
Result so far: 165166.91
Subtracting 400 from 600 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 11:
400 goes into 2000 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 165166.915
Deduct 2000 from 2000 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 12:
400 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 165166.915
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 13:
0 divided by 400 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 165166.915
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 165166.915, with a leftover of 0.0.