81539983 ÷ 980 
We're looking to find how many times 980 goes into 81539983.

Let's proceed to step 1:
If we divide 8 by 980, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 980

Let's proceed to step 2:
If we divide 81 by 980, we get 0 and a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Bring next digit (5) of the dividend behind the 81 and repeat the process: 815 / 980

Advancing to step 3:
The number 980 fits into 815 0 times, leaving a remainder of 815.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 815 to get 815.
Append the next digit (3) from the dividend to 815 and continue with: 8153 / 980

Going ahead to step 4:
If we divide 8153 by 980, we get 8 and a remainder of 313.
The next digit of our result is 8. 
Result so far: 8.0
If we take 7840 away from 8153, we end up with 313.
Include the next digit (9) from the dividend after 313, then repeat: 3139 / 980

Going ahead to step 5:
The number 980 fits into 3139 3 times, leaving a remainder of 199.
Put 3 as the next digit of the answer. 
Result so far: 83.0
Subtracting 2940 from 3139 leaves us with 199.
Append the next digit (9) from the dividend to 199 and continue with: 1999 / 980

On to step 6:
980 goes into 1999 2 times with a remainder of 39.
Use 2 as the next digit of our solution. 
Result so far: 832.0
Deduct 1960 from 1999 and we're left with 39.
Include the next digit (8) from the dividend after 39, then repeat: 398 / 980

Advancing to step 7:
980 goes into 398 0 times with a remainder of 398.
Write down 0 as next digit of the result. 
Result so far: 8320.0
Deduct 0 from 398 and we're left with 398.
Append the next digit (3) from the dividend to 398 and continue with: 3983 / 980

Going ahead to step 8:
3983 divided by 980 is 4 with a remainder of 63.
Put 4 as the next digit of the answer. 
Result so far: 83204.0
If we take 3920 away from 3983, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 9:
980 goes into 630 0 times with a remainder of 630.
Use 0 as the next digit of our solution. 
Result so far: 83204.0
Subtract 0 from 630 to get 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Moving on to step 10:
When dividing 6300 by 980, we get 6 with a remainder of 420.
Put 6 as the next digit of the answer. 
Result so far: 83204.06
Subtract 5880 from 6300 to get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Going ahead to step 11:
The number 980 fits into 4200 4 times, leaving a remainder of 280.
The number 4 becomes the next digit in our result. 
Result so far: 83204.064
If we take 3920 away from 4200, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Going ahead to step 12:
If we divide 2800 by 980, we get 2 and a remainder of 840.
Write down 2 as next digit of the result. 
Result so far: 83204.0642
Subtract 1960 from 2800 to get 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8400, and continue the process.

Step 13:
When dividing 8400 by 980, we get 8 with a remainder of 560.
Use 8 as the next digit of our solution. 
Result so far: 83204.06428
Subtracting 7840 from 8400 leaves us with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

On to step 14:
980 goes into 5600 5 times with a remainder of 700.
Record the quotient 5 as the next digit in the result. 
Result so far: 83204.064285
Deduct 4900 from 5600 and we're left with 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Moving on to step 15:
980 goes into 7000 7 times with a remainder of 140.
Record the quotient 7 as the next digit in the result. 
Result so far: 83204.0642857
If we subtract 6860 from 7000, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 16:
If we divide 1400 by 980, we get 1 and a remainder of 420.
The next digit of our result is 1. 
Result so far: 83204.06428571
If we take 980 away from 1400, we end up with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

The final outcome is 83204.06428571, with a leftover of 4.2e-07.