40166571 ÷ 378 
The aim is to understand the frequency of 378 in 40166571.

Moving on to step 1:
4 divided by 378 is 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 378

Advancing to step 2:
When dividing 40 by 378, we get 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 40 leaves us with 40.
Fetch the next digit (1) from the dividend, attach it to 40 and continue: 401 / 378

Let's proceed to step 3:
378 goes into 401 1 times with a remainder of 23.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 378 from 401 to get 23.
Grab the next digit (6) from the dividend, add it to 23, then carry on: 236 / 378

Going ahead to step 4:
When dividing 236 by 378, we get 0 with a remainder of 236.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 236 to get 236.
Take the next digit (6) from the dividend and append it to 236, then repeat: 2366 / 378

Advancing to step 5:
378 goes into 2366 6 times with a remainder of 98.
Record the quotient 6 as the next digit in the result. 
Result so far: 106.0
The remainder is 98 after subtracting 2268 from 2366.
Append the next digit (5) from the dividend to 98 and continue with: 985 / 378

Advancing to step 6:
985 divided by 378 is 2 with a remainder of 229.
The number 2 becomes the next digit in our result. 
Result so far: 1062.0
If we subtract 756 from 985, we get 229.
Bring next digit (7) of the dividend behind the 229 and repeat the process: 2297 / 378

Advancing to step 7:
When dividing 2297 by 378, we get 6 with a remainder of 29.
Write down 6 as next digit of the result. 
Result so far: 10626.0
If we take 2268 away from 2297, we end up with 29.
Bring next digit (1) of the dividend behind the 29 and repeat the process: 291 / 378

Going ahead to step 8:
378 goes into 291 0 times with a remainder of 291.
Put 0 as the next digit of the answer. 
Result so far: 106260.0
If we subtract 0 from 291, we get 291.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2910, and continue the process.

Moving on to step 9:
378 goes into 2910 7 times with a remainder of 264.
The number 7 becomes the next digit in our result. 
Result so far: 106260.7
Subtracting 2646 from 2910 leaves us with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Advancing to step 10:
2640 divided by 378 is 6 with a remainder of 372.
Put 6 as the next digit of the answer. 
Result so far: 106260.76
Subtracting 2268 from 2640 leaves us with 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Advancing to step 11:
When dividing 3720 by 378, we get 9 with a remainder of 318.
Use 9 as the next digit of our solution. 
Result so far: 106260.769
Subtracting 3402 from 3720 leaves us with 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Moving on to step 12:
378 can be fit into 3180 8 times, resulting in a remainder of 156.
Write down 8 as next digit of the result. 
Result so far: 106260.7698
Subtracting 3024 from 3180 leaves us with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Let's proceed to step 13:
1560 divided by 378 is 4 with a remainder of 48.
The next digit of our result is 4. 
Result so far: 106260.76984
If we subtract 1512 from 1560, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 14:
The number 378 fits into 480 1 times, leaving a remainder of 102.
Put 1 as the next digit of the answer. 
Result so far: 106260.769841
If we take 378 away from 480, we end up with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

On to step 15:
378 can be fit into 1020 2 times, resulting in a remainder of 264.
The next digit of our result is 2. 
Result so far: 106260.7698412
If we subtract 756 from 1020, we get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Let's proceed to step 16:
The number 378 fits into 2640 6 times, leaving a remainder of 372.
The next digit of our result is 6. 
Result so far: 106260.76984126
Subtracting 2268 from 2640 leaves us with 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

After the division, we end up with 106260.76984126 and a remainder of 3.72e-07.