We're dividing 99517451 by 258 
We want to divide 99517451 by 258.

Let's proceed to step 1:
9 divided by 258 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 258

Advancing to step 2:
When dividing 99 by 258, we get 0 with a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Grab the next digit (5) from the dividend, add it to 99, then carry on: 995 / 258

Let's proceed to step 3:
258 goes into 995 3 times with a remainder of 221.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 221 after subtracting 774 from 995.
Bring next digit (1) of the dividend behind the 221 and repeat the process: 2211 / 258

Going ahead to step 4:
2211 divided by 258 is 8 with a remainder of 147.
Use 8 as the next digit of our solution. 
Result so far: 38.0
Subtract 2064 from 2211 to get 147.
Bring next digit (7) of the dividend behind the 147 and repeat the process: 1477 / 258

Going ahead to step 5:
258 goes into 1477 5 times with a remainder of 187.
Put 5 as the next digit of the answer. 
Result so far: 385.0
Subtracting 1290 from 1477 leaves us with 187.
Grab the next digit (4) from the dividend, add it to 187, then carry on: 1874 / 258

Let's proceed to step 6:
1874 divided by 258 is 7 with a remainder of 68.
Write down 7 as next digit of the result. 
Result so far: 3857.0
Subtract 1806 from 1874 to get 68.
Grab the next digit (5) from the dividend, add it to 68, then carry on: 685 / 258

Advancing to step 7:
258 goes into 685 2 times with a remainder of 169.
Record the quotient 2 as the next digit in the result. 
Result so far: 38572.0
Subtract 516 from 685 to get 169.
Fetch the next digit (1) from the dividend, attach it to 169 and continue: 1691 / 258

Advancing to step 8:
258 can be fit into 1691 6 times, resulting in a remainder of 143.
Write down 6 as next digit of the result. 
Result so far: 385726.0
If we subtract 1548 from 1691, we get 143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

On to step 9:
If we divide 1430 by 258, we get 5 and a remainder of 140.
Put 5 as the next digit of the answer. 
Result so far: 385726.5
Subtracting 1290 from 1430 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Let's proceed to step 10:
When dividing 1400 by 258, we get 5 with a remainder of 110.
Put 5 as the next digit of the answer. 
Result so far: 385726.55
If we take 1290 away from 1400, we end up with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

The final result is 385726.55 with a remainder of 0.11.