95371591 ÷ 645 
The aim is to understand the frequency of 645 in 95371591.

Moving on to step 1:
When dividing 9 by 645, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 645

Let's proceed to step 2:
The number 645 fits into 95 0 times, leaving a remainder of 95.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 95, we end up with 95.
Take the next digit (3) from the dividend and append it to 95, then repeat: 953 / 645

Going ahead to step 3:
The number 645 fits into 953 1 times, leaving a remainder of 308.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 645 from 953 leaves us with 308.
Include the next digit (7) from the dividend after 308, then repeat: 3087 / 645

Let's proceed to step 4:
645 goes into 3087 4 times with a remainder of 507.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Subtract 2580 from 3087 to get 507.
Fetch the next digit (1) from the dividend, attach it to 507 and continue: 5071 / 645

Moving on to step 5:
When dividing 5071 by 645, we get 7 with a remainder of 556.
Record the quotient 7 as the next digit in the result. 
Result so far: 147.0
Deduct 4515 from 5071 and we're left with 556.
Grab the next digit (5) from the dividend, add it to 556, then carry on: 5565 / 645

Moving on to step 6:
645 goes into 5565 8 times with a remainder of 405.
Record the quotient 8 as the next digit in the result. 
Result so far: 1478.0
The remainder is 405 after subtracting 5160 from 5565.
Grab the next digit (9) from the dividend, add it to 405, then carry on: 4059 / 645

Moving on to step 7:
4059 divided by 645 is 6 with a remainder of 189.
Put 6 as the next digit of the answer. 
Result so far: 14786.0
Deduct 3870 from 4059 and we're left with 189.
Take the next digit (1) from the dividend and append it to 189, then repeat: 1891 / 645

Let's proceed to step 8:
If we divide 1891 by 645, we get 2 and a remainder of 601.
Record the quotient 2 as the next digit in the result. 
Result so far: 147862.0
Deduct 1290 from 1891 and we're left with 601.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6010, and continue the process.

Moving on to step 9:
645 can be fit into 6010 9 times, resulting in a remainder of 205.
Use 9 as the next digit of our solution. 
Result so far: 147862.9
If we take 5805 away from 6010, we end up with 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Moving on to step 10:
If we divide 2050 by 645, we get 3 and a remainder of 115.
Record the quotient 3 as the next digit in the result. 
Result so far: 147862.93
Subtract 1935 from 2050 to get 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

On to step 11:
1150 divided by 645 is 1 with a remainder of 505.
Put 1 as the next digit of the answer. 
Result so far: 147862.931
Subtract 645 from 1150 to get 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

Step 12:
5050 divided by 645 is 7 with a remainder of 535.
Write down 7 as next digit of the result. 
Result so far: 147862.9317
Subtracting 4515 from 5050 leaves us with 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

Advancing to step 13:
645 goes into 5350 8 times with a remainder of 190.
Write down 8 as next digit of the result. 
Result so far: 147862.93178
If we take 5160 away from 5350, we end up with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

On to step 14:
The number 645 fits into 1900 2 times, leaving a remainder of 610.
Write down 2 as next digit of the result. 
Result so far: 147862.931782
Subtracting 1290 from 1900 leaves us with 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Moving on to step 15:
When dividing 6100 by 645, we get 9 with a remainder of 295.
Write down 9 as next digit of the result. 
Result so far: 147862.9317829
If we take 5805 away from 6100, we end up with 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

On to step 16:
2950 divided by 645 is 4 with a remainder of 370.
Write down 4 as next digit of the result. 
Result so far: 147862.93178294
Subtracting 2580 from 2950 leaves us with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

The final outcome is 147862.93178294, with a leftover of 3.7e-07.