We look at the division of 84987980 by 660 
We want to figure out the number of times 84987980 can be divided by 660.

On to step 1:
660 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 660

Advancing to step 2:
If we divide 84 by 660, we get 0 and a remainder of 84.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 84 leaves us with 84.
Fetch the next digit (9) from the dividend, attach it to 84 and continue: 849 / 660

Going ahead to step 3:
The number 660 fits into 849 1 times, leaving a remainder of 189.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 660 from 849 to get 189.
Append the next digit (8) from the dividend to 189 and continue with: 1898 / 660

Going ahead to step 4:
The number 660 fits into 1898 2 times, leaving a remainder of 578.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we subtract 1320 from 1898, we get 578.
Grab the next digit (7) from the dividend, add it to 578, then carry on: 5787 / 660

Let's proceed to step 5:
If we divide 5787 by 660, we get 8 and a remainder of 507.
Record the quotient 8 as the next digit in the result. 
Result so far: 128.0
Deduct 5280 from 5787 and we're left with 507.
Append the next digit (9) from the dividend to 507 and continue with: 5079 / 660

On to step 6:
When dividing 5079 by 660, we get 7 with a remainder of 459.
Put 7 as the next digit of the answer. 
Result so far: 1287.0
Subtracting 4620 from 5079 leaves us with 459.
Take the next digit (8) from the dividend and append it to 459, then repeat: 4598 / 660

Step 7:
When dividing 4598 by 660, we get 6 with a remainder of 638.
Put 6 as the next digit of the answer. 
Result so far: 12876.0
If we take 3960 away from 4598, we end up with 638.
Append the next digit (0) from the dividend to 638 and continue with: 6380 / 660

Going ahead to step 8:
6380 divided by 660 is 9 with a remainder of 440.
Put 9 as the next digit of the answer. 
Result so far: 128769.0
Deduct 5940 from 6380 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Step 9:
When dividing 4400 by 660, we get 6 with a remainder of 440.
Put 6 as the next digit of the answer. 
Result so far: 128769.6
Deduct 3960 from 4400 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Step 10:
4400 divided by 660 is 6 with a remainder of 440.
Record the quotient 6 as the next digit in the result. 
Result so far: 128769.66
Subtracting 3960 from 4400 leaves us with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

The quotient of the division is 128769.66, and the remainder is 0.44.