27074258 ÷ 645 
The aim is to understand the frequency of 645 in 27074258.

Step 1:
When dividing 2 by 645, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (7) from the dividend after 2, then repeat: 27 / 645

Let's proceed to step 2:
When dividing 27 by 645, we get 0 with a remainder of 27.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 27 to get 27.
Bring next digit (0) of the dividend behind the 27 and repeat the process: 270 / 645

Moving on to step 3:
The number 645 fits into 270 0 times, leaving a remainder of 270.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 270 leaves us with 270.
Append the next digit (7) from the dividend to 270 and continue with: 2707 / 645

Advancing to step 4:
The number 645 fits into 2707 4 times, leaving a remainder of 127.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 2580 away from 2707, we end up with 127.
Bring next digit (4) of the dividend behind the 127 and repeat the process: 1274 / 645

Advancing to step 5:
If we divide 1274 by 645, we get 1 and a remainder of 629.
Put 1 as the next digit of the answer. 
Result so far: 41.0
The remainder is 629 after subtracting 645 from 1274.
Grab the next digit (2) from the dividend, add it to 629, then carry on: 6292 / 645

Moving on to step 6:
The number 645 fits into 6292 9 times, leaving a remainder of 487.
Write down 9 as next digit of the result. 
Result so far: 419.0
The remainder is 487 after subtracting 5805 from 6292.
Fetch the next digit (5) from the dividend, attach it to 487 and continue: 4875 / 645

Advancing to step 7:
4875 divided by 645 is 7 with a remainder of 360.
Write down 7 as next digit of the result. 
Result so far: 4197.0
Deduct 4515 from 4875 and we're left with 360.
Include the next digit (8) from the dividend after 360, then repeat: 3608 / 645

Let's proceed to step 8:
3608 divided by 645 is 5 with a remainder of 383.
The number 5 becomes the next digit in our result. 
Result so far: 41975.0
The remainder is 383 after subtracting 3225 from 3608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3830, and continue the process.

Going ahead to step 9:
645 goes into 3830 5 times with a remainder of 605.
Record the quotient 5 as the next digit in the result. 
Result so far: 41975.5
If we subtract 3225 from 3830, we get 605.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6050, and continue the process.

Step 10:
When dividing 6050 by 645, we get 9 with a remainder of 245.
Put 9 as the next digit of the answer. 
Result so far: 41975.59
Deduct 5805 from 6050 and we're left with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Step 11:
645 can be fit into 2450 3 times, resulting in a remainder of 515.
Put 3 as the next digit of the answer. 
Result so far: 41975.593
Subtracting 1935 from 2450 leaves us with 515.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5150, and continue the process.

Step 12:
If we divide 5150 by 645, we get 7 and a remainder of 635.
Put 7 as the next digit of the answer. 
Result so far: 41975.5937
The remainder is 635 after subtracting 4515 from 5150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6350, and continue the process.

Moving on to step 13:
If we divide 6350 by 645, we get 9 and a remainder of 545.
Record the quotient 9 as the next digit in the result. 
Result so far: 41975.59379
Subtracting 5805 from 6350 leaves us with 545.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

Step 14:
5450 divided by 645 is 8 with a remainder of 290.
Use 8 as the next digit of our solution. 
Result so far: 41975.593798
Subtract 5160 from 5450 to get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Going ahead to step 15:
645 goes into 2900 4 times with a remainder of 320.
The next digit of our result is 4. 
Result so far: 41975.5937984
If we subtract 2580 from 2900, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 16:
645 can be fit into 3200 4 times, resulting in a remainder of 620.
Write down 4 as next digit of the result. 
Result so far: 41975.59379844
The remainder is 620 after subtracting 2580 from 3200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

The quotient of the division is 41975.59379844, and the remainder is 6.2e-07.