We're dividing 57977882 by 90 
We want to figure out the number of times 57977882 can be divided by 90.

Step 1:
If we divide 5 by 90, we get 0 and a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 90

On to step 2:
57 divided by 90 is 0 with a remainder of 57.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 57, we end up with 57.
Bring next digit (9) of the dividend behind the 57 and repeat the process: 579 / 90

Advancing to step 3:
579 divided by 90 is 6 with a remainder of 39.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtracting 540 from 579 leaves us with 39.
Fetch the next digit (7) from the dividend, attach it to 39 and continue: 397 / 90

On to step 4:
397 divided by 90 is 4 with a remainder of 37.
Write down 4 as next digit of the result. 
Result so far: 64.0
The remainder is 37 after subtracting 360 from 397.
Bring next digit (7) of the dividend behind the 37 and repeat the process: 377 / 90

Let's proceed to step 5:
If we divide 377 by 90, we get 4 and a remainder of 17.
Put 4 as the next digit of the answer. 
Result so far: 644.0
Subtract 360 from 377 to get 17.
Fetch the next digit (8) from the dividend, attach it to 17 and continue: 178 / 90

Let's proceed to step 6:
If we divide 178 by 90, we get 1 and a remainder of 88.
Put 1 as the next digit of the answer. 
Result so far: 6441.0
If we subtract 90 from 178, we get 88.
Append the next digit (8) from the dividend to 88 and continue with: 888 / 90

On to step 7:
888 divided by 90 is 9 with a remainder of 78.
The number 9 becomes the next digit in our result. 
Result so far: 64419.0
If we take 810 away from 888, we end up with 78.
Fetch the next digit (2) from the dividend, attach it to 78 and continue: 782 / 90

Going ahead to step 8:
782 divided by 90 is 8 with a remainder of 62.
Record the quotient 8 as the next digit in the result. 
Result so far: 644198.0
Deduct 720 from 782 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 9:
620 divided by 90 is 6 with a remainder of 80.
Use 6 as the next digit of our solution. 
Result so far: 644198.6
Deduct 540 from 620 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 10:
90 goes into 800 8 times with a remainder of 80.
The number 8 becomes the next digit in our result. 
Result so far: 644198.68
The remainder is 80 after subtracting 720 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 11:
800 divided by 90 is 8 with a remainder of 80.
The number 8 becomes the next digit in our result. 
Result so far: 644198.688
Deduct 720 from 800 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final result is 644198.688 with a remainder of 0.008.