Let's divide 75910814 by 645
The aim is to understand the frequency of 645 in 75910814.

Let's proceed to step 1:
The number 645 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Append the next digit (5) from the dividend to 7 and continue with: 75 / 645

Advancing to step 2:
75 divided by 645 is 0 with a remainder of 75.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 75 to get 75.
Include the next digit (9) from the dividend after 75, then repeat: 759 / 645

Moving on to step 3:
When dividing 759 by 645, we get 1 with a remainder of 114.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 114 after subtracting 645 from 759.
Include the next digit (1) from the dividend after 114, then repeat: 1141 / 645

Going ahead to step 4:
If we divide 1141 by 645, we get 1 and a remainder of 496.
Use 1 as the next digit of our solution. 
Result so far: 11.0
The remainder is 496 after subtracting 645 from 1141.
Grab the next digit (0) from the dividend, add it to 496, then carry on: 4960 / 645

Let's proceed to step 5:
The number 645 fits into 4960 7 times, leaving a remainder of 445.
Put 7 as the next digit of the answer. 
Result so far: 117.0
Subtracting 4515 from 4960 leaves us with 445.
Append the next digit (8) from the dividend to 445 and continue with: 4458 / 645

On to step 6:
If we divide 4458 by 645, we get 6 and a remainder of 588.
The number 6 becomes the next digit in our result. 
Result so far: 1176.0
Subtract 3870 from 4458 to get 588.
Take the next digit (1) from the dividend and append it to 588, then repeat: 5881 / 645

Going ahead to step 7:
The number 645 fits into 5881 9 times, leaving a remainder of 76.
The next digit of our result is 9. 
Result so far: 11769.0
Subtract 5805 from 5881 to get 76.
Include the next digit (4) from the dividend after 76, then repeat: 764 / 645

Let's proceed to step 8:
If we divide 764 by 645, we get 1 and a remainder of 119.
Put 1 as the next digit of the answer. 
Result so far: 117691.0
If we subtract 645 from 764, we get 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Advancing to step 9:
645 goes into 1190 1 times with a remainder of 545.
Record the quotient 1 as the next digit in the result. 
Result so far: 117691.1
If we take 645 away from 1190, we end up 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.

Let's proceed to step 10:
5450 divided by 645 is 8 with a remainder of 290.
Write down 8 as next digit of the result. 
Result so far: 117691.18
Deduct 5160 from 5450 and we're left with 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 11:
645 goes into 2900 4 times with a remainder of 320.
Put 4 as the next digit of the answer. 
Result so far: 117691.184
Deduct 2580 from 2900 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Advancing to step 12:
645 can be fit into 3200 4 times, resulting in a remainder of 620.
The next digit of our result is 4. 
Result so far: 117691.1844
If we take 2580 away from 3200, we end up with 620.
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 117691.1844, and the remainder is 0.0062.