Let's divide 45089890 by 646
We want to divide 45089890 by 646.

Going ahead to step 1:
When dividing 4 by 646, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 646

On to step 2:
The number 646 fits into 45 0 times, leaving a remainder of 45.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 45 and we're left with 45.
Grab the next digit (0) from the dividend, add it to 45, then carry on: 450 / 646

Advancing to step 3:
When dividing 450 by 646, we get 0 with a remainder of 450.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 450 leaves us with 450.
Fetch the next digit (8) from the dividend, attach it to 450 and continue: 4508 / 646

On to step 4:
The number 646 fits into 4508 6 times, leaving a remainder of 632.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 632 after subtracting 3876 from 4508.
Fetch the next digit (9) from the dividend, attach it to 632 and continue: 6329 / 646

Moving on to step 5:
646 can be fit into 6329 9 times, resulting in a remainder of 515.
Put 9 as the next digit of the answer. 
Result so far: 69.0
Deduct 5814 from 6329 and we're left with 515.
Grab the next digit (8) from the dividend, add it to 515, then carry on: 5158 / 646

Going ahead to step 6:
646 can be fit into 5158 7 times, resulting in a remainder of 636.
Put 7 as the next digit of the answer. 
Result so far: 697.0
Subtracting 4522 from 5158 leaves us with 636.
Bring next digit (9) of the dividend behind the 636 and repeat the process: 6369 / 646

Moving on to step 7:
The number 646 fits into 6369 9 times, leaving a remainder of 555.
The number 9 becomes the next digit in our result. 
Result so far: 6979.0
Deduct 5814 from 6369 and we're left with 555.
Bring next digit (0) of the dividend behind the 555 and repeat the process: 5550 / 646

Step 8:
5550 divided by 646 is 8 with a remainder of 382.
The number 8 becomes the next digit in our result. 
Result so far: 69798.0
The remainder is 382 after subtracting 5168 from 5550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

Step 9:
When dividing 3820 by 646, we get 5 with a remainder of 590.
The next digit of our result is 5. 
Result so far: 69798.5
Subtract 3230 from 3820 to get 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

Let's proceed to step 10:
If we divide 5900 by 646, we get 9 and a remainder of 86.
Record the quotient 9 as the next digit in the result. 
Result so far: 69798.59
Deduct 5814 from 5900 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Step 11:
If we divide 860 by 646, we get 1 and a remainder of 214.
Write down 1 as next digit of the result. 
Result so far: 69798.591
If we subtract 646 from 860, we get 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

On to step 12:
The number 646 fits into 2140 3 times, leaving a remainder of 202.
The next digit of our result is 3. 
Result so far: 69798.5913
Deduct 1938 from 2140 and we're left with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Step 13:
2020 divided by 646 is 3 with a remainder of 82.
Write down 3 as next digit of the result. 
Result so far: 69798.59133
The remainder is 82 after subtracting 1938 from 2020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

The final result is 69798.59133 with a remainder of 8.2e-05.