15833464 ÷ 645 
The aim is to understand the frequency of 645 in 15833464.

Let's proceed to step 1:
1 divided by 645 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 645

Step 2:
645 can be fit into 15 0 times, resulting in a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Grab the next digit (8) from the dividend, add it to 15, then carry on: 158 / 645

Step 3:
645 goes into 158 0 times with a remainder of 158.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 158 and we're left with 158.
Bring next digit (3) of the dividend behind the 158 and repeat the process: 1583 / 645

Moving on to step 4:
645 can be fit into 1583 2 times, resulting in a remainder of 293.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 1290 from 1583 leaves us with 293.
Take the next digit (3) from the dividend and append it to 293, then repeat: 2933 / 645

Going ahead to step 5:
The number 645 fits into 2933 4 times, leaving a remainder of 353.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
If we subtract 2580 from 2933, we get 353.
Take the next digit (4) from the dividend and append it to 353, then repeat: 3534 / 645

Let's proceed to step 6:
When dividing 3534 by 645, we get 5 with a remainder of 309.
The number 5 becomes the next digit in our result. 
Result so far: 245.0
Subtracting 3225 from 3534 leaves us with 309.
Fetch the next digit (6) from the dividend, attach it to 309 and continue: 3096 / 645

On to step 7:
3096 divided by 645 is 4 with a remainder of 516.
Use 4 as the next digit of our solution. 
Result so far: 2454.0
Subtracting 2580 from 3096 leaves us with 516.
Fetch the next digit (4) from the dividend, attach it to 516 and continue: 5164 / 645

Advancing to step 8:
645 goes into 5164 8 times with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 24548.0
If we take 5160 away from 5164, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
645 can be fit into 40 0 times, resulting in a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 24548.0
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 10:
The number 645 fits into 400 0 times, leaving a remainder of 400.
Use 0 as the next digit of our solution. 
Result so far: 24548.0
The remainder is 400 after subtracting 0 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Our division results in 24548.0 with a remaining 0.4.