Let's divide 80781139 by 378
The aim is to understand the frequency of 378 in 80781139.

On to step 1:
If we divide 8 by 378, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 378

Step 2:
If we divide 80 by 378, we get 0 and a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Take the next digit (7) from the dividend and append it to 80, then repeat: 807 / 378

Going ahead to step 3:
378 can be fit into 807 2 times, resulting in a remainder of 51.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 756 away from 807, we end up with 51.
Take the next digit (8) from the dividend and append it to 51, then repeat: 518 / 378

Moving on to step 4:
378 can be fit into 518 1 times, resulting in a remainder of 140.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Subtracting 378 from 518 leaves us with 140.
Take the next digit (1) from the dividend and append it to 140, then repeat: 1401 / 378

On to step 5:
378 goes into 1401 3 times with a remainder of 267.
Write down 3 as next digit of the result. 
Result so far: 213.0
If we subtract 1134 from 1401, we get 267.
Bring next digit (1) of the dividend behind the 267 and repeat the process: 2671 / 378

Step 6:
If we divide 2671 by 378, we get 7 and a remainder of 25.
The next digit of our result is 7. 
Result so far: 2137.0
The remainder is 25 after subtracting 2646 from 2671.
Bring next digit (3) of the dividend behind the 25 and repeat the process: 253 / 378

Moving on to step 7:
When dividing 253 by 378, we get 0 with a remainder of 253.
Write down 0 as next digit of the result. 
Result so far: 21370.0
Deduct 0 from 253 and we're left with 253.
Take the next digit (9) from the dividend and append it to 253, then repeat: 2539 / 378

Advancing to step 8:
2539 divided by 378 is 6 with a remainder of 271.
Record the quotient 6 as the next digit in the result. 
Result so far: 213706.0
Deduct 2268 from 2539 and we're left with 271.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

Let's proceed to step 9:
When dividing 2710 by 378, we get 7 with a remainder of 64.
Write down 7 as next digit of the result. 
Result so far: 213706.7
Subtract 2646 from 2710 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 10:
The number 378 fits into 640 1 times, leaving a remainder of 262.
The next digit of our result is 1. 
Result so far: 213706.71
If we subtract 378 from 640, we get 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Let's proceed to step 11:
The number 378 fits into 2620 6 times, leaving a remainder of 352.
The next digit of our result is 6. 
Result so far: 213706.716
Deduct 2268 from 2620 and we're left with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Step 12:
378 goes into 3520 9 times with a remainder of 118.
The next digit of our result is 9. 
Result so far: 213706.7169
The remainder is 118 after subtracting 3402 from 3520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

Going ahead to step 13:
If we divide 1180 by 378, we get 3 and a remainder of 46.
Put 3 as the next digit of the answer. 
Result so far: 213706.71693
Subtracting 1134 from 1180 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 14:
378 goes into 460 1 times with a remainder of 82.
Use 1 as the next digit of our solution. 
Result so far: 213706.716931
Subtract 378 from 460 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

On to step 15:
If we divide 820 by 378, we get 2 and a remainder of 64.
The next digit of our result is 2. 
Result so far: 213706.7169312
If we subtract 756 from 820, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 16:
378 can be fit into 640 1 times, resulting in a remainder of 262.
Use 1 as the next digit of our solution. 
Result so far: 213706.71693121
Subtract 378 from 640 to get 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Our division results in 213706.71693121 with a remaining 2.62e-07.