Let's divide 34391604 by 645
We want to divide 34391604 by 645.

Step 1:
When dividing 3 by 645, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 645

On to step 2:
The number 645 fits into 34 0 times, leaving a remainder of 34.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 34 leaves us with 34.
Include the next digit (3) from the dividend after 34, then repeat: 343 / 645

On to step 3:
343 divided by 645 is 0 with a remainder of 343.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 343 after subtracting 0 from 343.
Grab the next digit (9) from the dividend, add it to 343, then carry on: 3439 / 645

Going ahead to step 4:
645 can be fit into 3439 5 times, resulting in a remainder of 214.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Deduct 3225 from 3439 and we're left with 214.
Append the next digit (1) from the dividend to 214 and continue with: 2141 / 645

Let's proceed to step 5:
645 can be fit into 2141 3 times, resulting in a remainder of 206.
Record the quotient 3 as the next digit in the result. 
Result so far: 53.0
Deduct 1935 from 2141 and we're left with 206.
Take the next digit (6) from the dividend and append it to 206, then repeat: 2066 / 645

Advancing to step 6:
When dividing 2066 by 645, we get 3 with a remainder of 131.
Use 3 as the next digit of our solution. 
Result so far: 533.0
Subtract 1935 from 2066 to get 131.
Bring next digit (0) of the dividend behind the 131 and repeat the process: 1310 / 645

Advancing to step 7:
1310 divided by 645 is 2 with a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 5332.0
If we take 1290 away from 1310, we end up with 20.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 645

On to step 8:
When dividing 204 by 645, we get 0 with a remainder of 204.
The number 0 becomes the next digit in our result. 
Result so far: 53320.0
Deduct 0 from 204 and we're left with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Step 9:
When dividing 2040 by 645, we get 3 with a remainder of 105.
The next digit of our result is 3. 
Result so far: 53320.3
If we take 1935 away from 2040, we end up with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Advancing to step 10:
645 goes into 1050 1 times with a remainder of 405.
The number 1 becomes the next digit in our result. 
Result so far: 53320.31
Deduct 645 from 1050 and we're left with 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Advancing to step 11:
645 goes into 4050 6 times with a remainder of 180.
The number 6 becomes the next digit in our result. 
Result so far: 53320.316
Subtracting 3870 from 4050 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 12:
When dividing 1800 by 645, we get 2 with a remainder of 510.
Record the quotient 2 as the next digit in the result. 
Result so far: 53320.3162
Deduct 1290 from 1800 and we're left with 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Moving on to step 13:
645 can be fit into 5100 7 times, resulting in a remainder of 585.
The next digit of our result is 7. 
Result so far: 53320.31627
Deduct 4515 from 5100 and we're left with 585.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5850, and continue the process.

Advancing to step 14:
645 can be fit into 5850 9 times, resulting in a remainder of 45.
The next digit of our result is 9. 
Result so far: 53320.316279
If we take 5805 away from 5850, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 15:
The number 645 fits into 450 0 times, leaving a remainder of 450.
Write down 0 as next digit of the result. 
Result so far: 53320.316279
Subtracting 0 from 450 leaves us with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Step 16:
When dividing 4500 by 645, we get 6 with a remainder of 630.
The next digit of our result is 6. 
Result so far: 53320.31627906
The remainder is 630 after subtracting 3870 from 4500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

The final result is 53320.31627906 with a remainder of 6.3e-07.