Let's divide 21074169 by 645
We want to divide 21074169 by 645.

On to step 1:
When dividing 2 by 645, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 645

Going ahead to step 2:
21 divided by 645 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Bring next digit (0) of the dividend behind the 21 and repeat the process: 210 / 645

Advancing to step 3:
645 goes into 210 0 times with a remainder of 210.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 210 after subtracting 0 from 210.
Grab the next digit (7) from the dividend, add it to 210, then carry on: 2107 / 645

On to step 4:
If we divide 2107 by 645, we get 3 and a remainder of 172.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 1935 from 2107 and we're left with 172.
Grab the next digit (4) from the dividend, add it to 172, then carry on: 1724 / 645

Step 5:
645 goes into 1724 2 times with a remainder of 434.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
If we take 1290 away from 1724, we end up with 434.
Append the next digit (1) from the dividend to 434 and continue with: 4341 / 645

On to step 6:
645 goes into 4341 6 times with a remainder of 471.
Put 6 as the next digit of the answer. 
Result so far: 326.0
If we subtract 3870 from 4341, we get 471.
Include the next digit (6) from the dividend after 471, then repeat: 4716 / 645

Advancing to step 7:
When dividing 4716 by 645, we get 7 with a remainder of 201.
The next digit of our result is 7. 
Result so far: 3267.0
Subtract 4515 from 4716 to get 201.
Grab the next digit (9) from the dividend, add it to 201, then carry on: 2019 / 645

Let's proceed to step 8:
When dividing 2019 by 645, we get 3 with a remainder of 84.
Use 3 as the next digit of our solution. 
Result so far: 32673.0
If we subtract 1935 from 2019, we get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Moving on to step 9:
The number 645 fits into 840 1 times, leaving a remainder of 195.
Use 1 as the next digit of our solution. 
Result so far: 32673.1
Subtract 645 from 840 to get 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Moving on to step 10:
1950 divided by 645 is 3 with a remainder of 15.
The next digit of our result is 3. 
Result so far: 32673.13
If we subtract 1935 from 1950, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 11:
150 divided by 645 is 0 with a remainder of 150.
The number 0 becomes the next digit in our result. 
Result so far: 32673.13
If we take 0 away from 150, we end up with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 12:
When dividing 1500 by 645, we get 2 with a remainder of 210.
Record the quotient 2 as the next digit in the result. 
Result so far: 32673.1302
If we take 1290 away from 1500, we end up with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

On to step 13:
When dividing 2100 by 645, we get 3 with a remainder of 165.
The next digit of our result is 3. 
Result so far: 32673.13023
If we subtract 1935 from 2100, we get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

On to step 14:
When dividing 1650 by 645, we get 2 with a remainder of 360.
Use 2 as the next digit of our solution. 
Result so far: 32673.130232
Subtracting 1290 from 1650 leaves us with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 15:
The number 645 fits into 3600 5 times, leaving a remainder of 375.
Use 5 as the next digit of our solution. 
Result so far: 32673.1302325
Subtracting 3225 from 3600 leaves us with 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Going ahead to step 16:
645 can be fit into 3750 5 times, resulting in a remainder of 525.
Put 5 as the next digit of the answer. 
Result so far: 32673.13023255
Subtracting 3225 from 3750 leaves us with 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

Our division results in 32673.13023255 with a remaining 5.25e-07.