We're dividing 54939718 by 645 
The aim is to understand the frequency of 645 in 54939718.

Moving on to step 1:
645 goes into 5 0 times with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (4) of the dividend behind the 5 and repeat the process: 54 / 645

Step 2:
The number 645 fits into 54 0 times, leaving a remainder of 54.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 54 to get 54.
Take the next digit (9) from the dividend and append it to 54, then repeat: 549 / 645

Moving on to step 3:
645 goes into 549 0 times with a remainder of 549.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 549, we end up with 549.
Bring next digit (3) of the dividend behind the 549 and repeat the process: 5493 / 645

Advancing to step 4:
If we divide 5493 by 645, we get 8 and a remainder of 333.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 5160 from 5493 leaves us with 333.
Take the next digit (9) from the dividend and append it to 333, then repeat: 3339 / 645

Advancing to step 5:
The number 645 fits into 3339 5 times, leaving a remainder of 114.
Write down 5 as next digit of the result. 
Result so far: 85.0
Subtracting 3225 from 3339 leaves us with 114.
Take the next digit (7) from the dividend and append it to 114, then repeat: 1147 / 645

Going ahead to step 6:
645 goes into 1147 1 times with a remainder of 502.
Write down 1 as next digit of the result. 
Result so far: 851.0
If we subtract 645 from 1147, we get 502.
Bring next digit (1) of the dividend behind the 502 and repeat the process: 5021 / 645

Going ahead to step 7:
645 can be fit into 5021 7 times, resulting in a remainder of 506.
The next digit of our result is 7. 
Result so far: 8517.0
If we take 4515 away from 5021, we end up with 506.
Fetch the next digit (8) from the dividend, attach it to 506 and continue: 5068 / 645

Moving on to step 8:
5068 divided by 645 is 7 with a remainder of 553.
Record the quotient 7 as the next digit in the result. 
Result so far: 85177.0
If we subtract 4515 from 5068, we get 553.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5530, and continue the process.

Moving on to step 9:
The number 645 fits into 5530 8 times, leaving a remainder of 370.
Write down 8 as next digit of the result. 
Result so far: 85177.8
Subtract 5160 from 5530 to get 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

On to step 10:
645 can be fit into 3700 5 times, resulting in a remainder of 475.
Write down 5 as next digit of the result. 
Result so far: 85177.85
If we subtract 3225 from 3700, we get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Moving on to step 11:
4750 divided by 645 is 7 with a remainder of 235.
Put 7 as the next digit of the answer. 
Result so far: 85177.857
The remainder is 235 after subtracting 4515 from 4750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Let's proceed to step 12:
The number 645 fits into 2350 3 times, leaving a remainder of 415.
Use 3 as the next digit of our solution. 
Result so far: 85177.8573
If we subtract 1935 from 2350, we get 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Going ahead to step 13:
If we divide 4150 by 645, we get 6 and a remainder of 280.
Put 6 as the next digit of the answer. 
Result so far: 85177.85736
Deduct 3870 from 4150 and we're left with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 14:
645 can be fit into 2800 4 times, resulting in a remainder of 220.
The next digit of our result is 4. 
Result so far: 85177.857364
Subtracting 2580 from 2800 leaves us with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 15:
If we divide 2200 by 645, we get 3 and a remainder of 265.
Record the quotient 3 as the next digit in the result. 
Result so far: 85177.8573643
The remainder is 265 after subtracting 1935 from 2200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Let's proceed to step 16:
645 can be fit into 2650 4 times, resulting in a remainder of 70.
Record the quotient 4 as the next digit in the result. 
Result so far: 85177.85736434
Subtract 2580 from 2650 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

After the division, we end up with 85177.85736434 and a remainder of 7e-08.