We look at the division of 45682234 by 645 
The aim is to understand the frequency of 645 in 45682234.

Going ahead to step 1:
645 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 645

Moving on to step 2:
When dividing 45 by 645, we get 0 with a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 45 and we're left with 45.
Take the next digit (6) from the dividend and append it to 45, then repeat: 456 / 645

Advancing to step 3:
456 divided by 645 is 0 with a remainder of 456.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 456, we end up with 456.
Grab the next digit (8) from the dividend, add it to 456, then carry on: 4568 / 645

Moving on to step 4:
4568 divided by 645 is 7 with a remainder of 53.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtract 4515 from 4568 to get 53.
Take the next digit (2) from the dividend and append it to 53, then repeat: 532 / 645

Moving on to step 5:
532 divided by 645 is 0 with a remainder of 532.
The next digit of our result is 0. 
Result so far: 70.0
If we subtract 0 from 532, we get 532.
Fetch the next digit (2) from the dividend, attach it to 532 and continue: 5322 / 645

On to step 6:
645 can be fit into 5322 8 times, resulting in a remainder of 162.
Put 8 as the next digit of the answer. 
Result so far: 708.0
Subtracting 5160 from 5322 leaves us with 162.
Append the next digit (3) from the dividend to 162 and continue with: 1623 / 645

Moving on to step 7:
1623 divided by 645 is 2 with a remainder of 333.
The number 2 becomes the next digit in our result. 
Result so far: 7082.0
If we subtract 1290 from 1623, we get 333.
Grab the next digit (4) from the dividend, add it to 333, then carry on: 3334 / 645

Advancing to step 8:
645 can be fit into 3334 5 times, resulting in a remainder of 109.
The number 5 becomes the next digit in our result. 
Result so far: 70825.0
The remainder is 109 after subtracting 3225 from 3334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

On to step 9:
1090 divided by 645 is 1 with a remainder of 445.
Record the quotient 1 as the next digit in the result. 
Result so far: 70825.1
The remainder is 445 after subtracting 645 from 1090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

Moving on to step 10:
If we divide 4450 by 645, we get 6 and a remainder of 580.
Record the quotient 6 as the next digit in the result. 
Result so far: 70825.16
Subtracting 3870 from 4450 leaves us with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Step 11:
When dividing 5800 by 645, we get 8 with a remainder of 640.
The number 8 becomes the next digit in our result. 
Result so far: 70825.168
If we subtract 5160 from 5800, we get 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Let's proceed to step 12:
When dividing 6400 by 645, we get 9 with a remainder of 595.
Record the quotient 9 as the next digit in the result. 
Result so far: 70825.1689
Subtract 5805 from 6400 to get 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Advancing to step 13:
645 can be fit into 5950 9 times, resulting in a remainder of 145.
Write down 9 as next digit of the result. 
Result so far: 70825.16899
Deduct 5805 from 5950 and we're left with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

The final result is 70825.16899 with a remainder of 0.000145.