58510820 ÷ 645 
Our goal is to divide 58510820 by 645.

Moving on to step 1:
5 divided by 645 is 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (8) from the dividend, attach it to 5 and continue: 58 / 645

Moving on to step 2:
If we divide 58 by 645, we get 0 and a remainder of 58.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 58 and we're left with 58.
Bring next digit (5) of the dividend behind the 58 and repeat the process: 585 / 645

Step 3:
645 goes into 585 0 times with a remainder of 585.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 585 to get 585.
Bring next digit (1) of the dividend behind the 585 and repeat the process: 5851 / 645

Advancing to step 4:
645 goes into 5851 9 times with a remainder of 46.
The next digit of our result is 9. 
Result so far: 9.0
Subtract 5805 from 5851 to get 46.
Take the next digit (0) from the dividend and append it to 46, then repeat: 460 / 645

Let's proceed to step 5:
If we divide 460 by 645, we get 0 and a remainder of 460.
Write down 0 as next digit of the result. 
Result so far: 90.0
The remainder is 460 after subtracting 0 from 460.
Bring next digit (8) of the dividend behind the 460 and repeat the process: 4608 / 645

On to step 6:
4608 divided by 645 is 7 with a remainder of 93.
The next digit of our result is 7. 
Result so far: 907.0
If we subtract 4515 from 4608, we get 93.
Append the next digit (2) from the dividend to 93 and continue with: 932 / 645

Moving on to step 7:
When dividing 932 by 645, we get 1 with a remainder of 287.
The next digit of our result is 1. 
Result so far: 9071.0
Subtracting 645 from 932 leaves us with 287.
Grab the next digit (0) from the dividend, add it to 287, then carry on: 2870 / 645

On to step 8:
2870 divided by 645 is 4 with a remainder of 290.
Record the quotient 4 as the next digit in the result. 
Result so far: 90714.0
Subtracting 2580 from 2870 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Step 9:
2900 divided by 645 is 4 with a remainder of 320.
Write down 4 as next digit of the result. 
Result so far: 90714.4
Subtract 2580 from 2900 to get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 10:
3200 divided by 645 is 4 with a remainder of 620.
The next digit of our result is 4. 
Result so far: 90714.44
Subtracting 2580 from 3200 leaves us with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

The final outcome is 90714.44, with a leftover of 0.62.