We're dividing 83985459 by 648 
We want to figure out the number of times 83985459 can be divided by 648.

On to step 1:
The number 648 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 648

Going ahead to step 2:
The number 648 fits into 83 0 times, leaving a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 83, we get 83.
Append the next digit (9) from the dividend to 83 and continue with: 839 / 648

On to step 3:
648 can be fit into 839 1 times, resulting in a remainder of 191.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 648 from 839, we get 191.
Append the next digit (8) from the dividend to 191 and continue with: 1918 / 648

On to step 4:
The number 648 fits into 1918 2 times, leaving a remainder of 622.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we take 1296 away from 1918, we end up with 622.
Fetch the next digit (5) from the dividend, attach it to 622 and continue: 6225 / 648

On to step 5:
The number 648 fits into 6225 9 times, leaving a remainder of 393.
Record the quotient 9 as the next digit in the result. 
Result so far: 129.0
If we take 5832 away from 6225, we end up with 393.
Append the next digit (4) from the dividend to 393 and continue with: 3934 / 648

Step 6:
648 can be fit into 3934 6 times, resulting in a remainder of 46.
Use 6 as the next digit of our solution. 
Result so far: 1296.0
Subtract 3888 from 3934 to get 46.
Include the next digit (5) from the dividend after 46, then repeat: 465 / 648

Step 7:
648 can be fit into 465 0 times, resulting in a remainder of 465.
Put 0 as the next digit of the answer. 
Result so far: 12960.0
The remainder is 465 after subtracting 0 from 465.
Fetch the next digit (9) from the dividend, attach it to 465 and continue: 4659 / 648

Moving on to step 8:
648 can be fit into 4659 7 times, resulting in a remainder of 123.
The number 7 becomes the next digit in our result. 
Result so far: 129607.0
If we take 4536 away from 4659, we end up with 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

Step 9:
If we divide 1230 by 648, we get 1 and a remainder of 582.
The next digit of our result is 1. 
Result so far: 129607.1
The remainder is 582 after subtracting 648 from 1230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5820, and continue the process.

On to step 10:
648 goes into 5820 8 times with a remainder of 636.
Use 8 as the next digit of our solution. 
Result so far: 129607.18
If we subtract 5184 from 5820, we get 636.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

Advancing to step 11:
648 goes into 6360 9 times with a remainder of 528.
Write down 9 as next digit of the result. 
Result so far: 129607.189
Deduct 5832 from 6360 and we're left with 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Moving on to step 12:
5280 divided by 648 is 8 with a remainder of 96.
The number 8 becomes the next digit in our result. 
Result so far: 129607.1898
Deduct 5184 from 5280 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Moving on to step 13:
648 can be fit into 960 1 times, resulting in a remainder of 312.
Record the quotient 1 as the next digit in the result. 
Result so far: 129607.18981
If we subtract 648 from 960, we get 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Going ahead to step 14:
648 goes into 3120 4 times with a remainder of 528.
The next digit of our result is 4. 
Result so far: 129607.189814
The remainder is 528 after subtracting 2592 from 3120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Going ahead to step 15:
When dividing 5280 by 648, we get 8 with a remainder of 96.
Record the quotient 8 as the next digit in the result. 
Result so far: 129607.1898148
Deduct 5184 from 5280 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Let's proceed to step 16:
The number 648 fits into 960 1 times, leaving a remainder of 312.
Write down 1 as next digit of the result. 
Result so far: 129607.18981481
The remainder is 312 after subtracting 648 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

The quotient of the division is 129607.18981481, and the remainder is 3.12e-07.