We're dividing 45517523 by 644 
Let's see how many times 644 fits into 45517523.

Moving on to step 1:
When dividing 4 by 644, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our 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 / 644

Step 2:
644 goes into 45 0 times with a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 45, we end up with 45.
Include the next digit (5) from the dividend after 45, then repeat: 455 / 644

On to step 3:
The number 644 fits into 455 0 times, leaving a remainder of 455.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 455, we get 455.
Bring next digit (1) of the dividend behind the 455 and repeat the process: 4551 / 644

Going ahead to step 4:
644 can be fit into 4551 7 times, resulting in a remainder of 43.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 43 after subtracting 4508 from 4551.
Include the next digit (7) from the dividend after 43, then repeat: 437 / 644

Let's proceed to step 5:
644 can be fit into 437 0 times, resulting in a remainder of 437.
The number 0 becomes the next digit in our result. 
Result so far: 70.0
Subtract 0 from 437 to get 437.
Take the next digit (5) from the dividend and append it to 437, then repeat: 4375 / 644

Moving on to step 6:
When dividing 4375 by 644, we get 6 with a remainder of 511.
The number 6 becomes the next digit in our result. 
Result so far: 706.0
Subtracting 3864 from 4375 leaves us with 511.
Append the next digit (2) from the dividend to 511 and continue with: 5112 / 644

Going ahead to step 7:
If we divide 5112 by 644, we get 7 and a remainder of 604.
Record the quotient 7 as the next digit in the result. 
Result so far: 7067.0
The remainder is 604 after subtracting 4508 from 5112.
Include the next digit (3) from the dividend after 604, then repeat: 6043 / 644

Moving on to step 8:
When dividing 6043 by 644, we get 9 with a remainder of 247.
Put 9 as the next digit of the answer. 
Result so far: 70679.0
If we take 5796 away from 6043, we end up with 247.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2470, and continue the process.

Going ahead to step 9:
If we divide 2470 by 644, we get 3 and a remainder of 538.
The number 3 becomes the next digit in our result. 
Result so far: 70679.3
The remainder is 538 after subtracting 1932 from 2470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5380, and continue the process.

On to step 10:
644 goes into 5380 8 times with a remainder of 228.
Put 8 as the next digit of the answer. 
Result so far: 70679.38
Deduct 5152 from 5380 and we're left with 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Step 11:
644 can be fit into 2280 3 times, resulting in a remainder of 348.
Write down 3 as next digit of the result. 
Result so far: 70679.383
Subtracting 1932 from 2280 leaves us with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Advancing to step 12:
The number 644 fits into 3480 5 times, leaving a remainder of 260.
Use 5 as the next digit of our solution. 
Result so far: 70679.3835
If we subtract 3220 from 3480, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Advancing to step 13:
2600 divided by 644 is 4 with a remainder of 24.
The next digit of our result is 4. 
Result so far: 70679.38354
Deduct 2576 from 2600 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 14:
If we divide 240 by 644, we get 0 and a remainder of 240.
The next digit of our result is 0. 
Result so far: 70679.38354
If we take 0 away from 240, we end up with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 15:
644 can be fit into 2400 3 times, resulting in a remainder of 468.
The number 3 becomes the next digit in our result. 
Result so far: 70679.3835403
If we take 1932 away from 2400, we end up with 468.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4680, and continue the process.

Advancing to step 16:
If we divide 4680 by 644, we get 7 and a remainder of 172.
Use 7 as the next digit of our solution. 
Result so far: 70679.38354037
If we subtract 4508 from 4680, we get 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

The final outcome is 70679.38354037, with a leftover of 1.72e-07.