31284006 ÷ 645 
The aim is to understand the frequency of 645 in 31284006.

Going ahead to step 1:
3 divided by 645 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 645

On to step 2:
31 divided by 645 is 0 with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 31 leaves us with 31.
Grab the next digit (2) from the dividend, add it to 31, then carry on: 312 / 645

On to step 3:
If we divide 312 by 645, we get 0 and a remainder of 312.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 312, we get 312.
Include the next digit (8) from the dividend after 312, then repeat: 3128 / 645

Let's proceed to step 4:
645 goes into 3128 4 times with a remainder of 548.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Deduct 2580 from 3128 and we're left with 548.
Include the next digit (4) from the dividend after 548, then repeat: 5484 / 645

Step 5:
If we divide 5484 by 645, we get 8 and a remainder of 324.
The number 8 becomes the next digit in our result. 
Result so far: 48.0
Subtracting 5160 from 5484 leaves us with 324.
Bring next digit (0) of the dividend behind the 324 and repeat the process: 3240 / 645

Step 6:
3240 divided by 645 is 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 485.0
Subtracting 3225 from 3240 leaves us with 15.
Take the next digit (0) from the dividend and append it to 15, then repeat: 150 / 645

Going ahead to step 7:
645 can be fit into 150 0 times, resulting in a remainder of 150.
Put 0 as the next digit of the answer. 
Result so far: 4850.0
Subtract 0 from 150 to get 150.
Bring next digit (6) of the dividend behind the 150 and repeat the process: 1506 / 645

On to step 8:
The number 645 fits into 1506 2 times, leaving a remainder of 216.
Write down 2 as next digit of the result. 
Result so far: 48502.0
The remainder is 216 after subtracting 1290 from 1506.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Moving on to step 9:
2160 divided by 645 is 3 with a remainder of 225.
Record the quotient 3 as the next digit in the result. 
Result so far: 48502.3
Deduct 1935 from 2160 and we're left with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Step 10:
The number 645 fits into 2250 3 times, leaving a remainder of 315.
Record the quotient 3 as the next digit in the result. 
Result so far: 48502.33
If we subtract 1935 from 2250, we get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

In conclusion, the division gives 48502.33 with a balance of 0.315.