We look at the division of 84910421 by 977 
Let's see how many times 977 fits into 84910421.

On to step 1:
When dividing 8 by 977, we get 0 with a remainder of 8.
Write down 0 as next digit of 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 / 977

Step 2:
977 can be fit into 84 0 times, resulting in a remainder of 84.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 84 leaves us with 84.
Grab the next digit (9) from the dividend, add it to 84, then carry on: 849 / 977

Advancing to step 3:
977 can be fit into 849 0 times, resulting in a remainder of 849.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 849, we get 849.
Fetch the next digit (1) from the dividend, attach it to 849 and continue: 8491 / 977

Step 4:
The number 977 fits into 8491 8 times, leaving a remainder of 675.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtracting 7816 from 8491 leaves us with 675.
Bring next digit (0) of the dividend behind the 675 and repeat the process: 6750 / 977

Step 5:
If we divide 6750 by 977, we get 6 and a remainder of 888.
Write down 6 as next digit of the result. 
Result so far: 86.0
The remainder is 888 after subtracting 5862 from 6750.
Fetch the next digit (4) from the dividend, attach it to 888 and continue: 8884 / 977

Going ahead to step 6:
8884 divided by 977 is 9 with a remainder of 91.
The number 9 becomes the next digit in our result. 
Result so far: 869.0
Subtracting 8793 from 8884 leaves us with 91.
Append the next digit (2) from the dividend to 91 and continue with: 912 / 977

Going ahead to step 7:
If we divide 912 by 977, we get 0 and a remainder of 912.
Write down 0 as next digit of the result. 
Result so far: 8690.0
Subtract 0 from 912 to get 912.
Fetch the next digit (1) from the dividend, attach it to 912 and continue: 9121 / 977

Moving on to step 8:
977 can be fit into 9121 9 times, resulting in a remainder of 328.
Write down 9 as next digit of the result. 
Result so far: 86909.0
The remainder is 328 after subtracting 8793 from 9121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Advancing to step 9:
3280 divided by 977 is 3 with a remainder of 349.
The number 3 becomes the next digit in our result. 
Result so far: 86909.3
Subtract 2931 from 3280 to get 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Going ahead to step 10:
977 goes into 3490 3 times with a remainder of 559.
The next digit of our result is 3. 
Result so far: 86909.33
Subtracting 2931 from 3490 leaves us with 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

After the division, we end up with 86909.33 and a remainder of 0.559.