We look at the division of 65434480 by 378 
The aim is to understand the frequency of 378 in 65434480.

Step 1:
The number 378 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 378

On to step 2:
When dividing 65 by 378, we get 0 with a remainder of 65.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 65 after subtracting 0 from 65.
Append the next digit (4) from the dividend to 65 and continue with: 654 / 378

Advancing to step 3:
378 can be fit into 654 1 times, resulting in a remainder of 276.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 378 from 654 leaves us with 276.
Fetch the next digit (3) from the dividend, attach it to 276 and continue: 2763 / 378

Going ahead to step 4:
The number 378 fits into 2763 7 times, leaving a remainder of 117.
The next digit of our result is 7. 
Result so far: 17.0
Deduct 2646 from 2763 and we're left with 117.
Bring next digit (4) of the dividend behind the 117 and repeat the process: 1174 / 378

Advancing to step 5:
1174 divided by 378 is 3 with a remainder of 40.
Write down 3 as next digit of the result. 
Result so far: 173.0
If we take 1134 away from 1174, we end up with 40.
Bring next digit (4) of the dividend behind the 40 and repeat the process: 404 / 378

On to step 6:
378 can be fit into 404 1 times, resulting in a remainder of 26.
The number 1 becomes the next digit in our result. 
Result so far: 1731.0
Deduct 378 from 404 and we're left with 26.
Grab the next digit (8) from the dividend, add it to 26, then carry on: 268 / 378

Going ahead to step 7:
378 goes into 268 0 times with a remainder of 268.
Put 0 as the next digit of the answer. 
Result so far: 17310.0
Subtracting 0 from 268 leaves us with 268.
Bring next digit (0) of the dividend behind the 268 and repeat the process: 2680 / 378

Step 8:
378 can be fit into 2680 7 times, resulting in a remainder of 34.
Put 7 as the next digit of the answer. 
Result so far: 173107.0
If we take 2646 away from 2680, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 9:
The number 378 fits into 340 0 times, leaving a remainder of 340.
Record the quotient 0 as the next digit in the result. 
Result so far: 173107.0
Subtract 0 from 340 to get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Going ahead to step 10:
When dividing 3400 by 378, we get 8 with a remainder of 376.
Record the quotient 8 as the next digit in the result. 
Result so far: 173107.08
Subtracting 3024 from 3400 leaves us with 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Going ahead to step 11:
If we divide 3760 by 378, we get 9 and a remainder of 358.
Put 9 as the next digit of the answer. 
Result so far: 173107.089
Subtracting 3402 from 3760 leaves us with 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Advancing to step 12:
378 goes into 3580 9 times with a remainder of 178.
The number 9 becomes the next digit in our result. 
Result so far: 173107.0899
If we take 3402 away from 3580, we end up with 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

Our division results in 173107.0899 with a remaining 0.00178.