99970165 divided by 258 
Our goal is to divide 99970165 by 258.

Step 1:
258 goes into 9 0 times with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 258

Advancing to step 2:
The number 258 fits into 99 0 times, leaving a remainder of 99.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 99, we get 99.
Grab the next digit (9) from the dividend, add it to 99, then carry on: 999 / 258

Advancing to step 3:
When dividing 999 by 258, we get 3 with a remainder of 225.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 774 from 999 and we're left with 225.
Grab the next digit (7) from the dividend, add it to 225, then carry on: 2257 / 258

Step 4:
258 goes into 2257 8 times with a remainder of 193.
Write down 8 as next digit of the result. 
Result so far: 38.0
Deduct 2064 from 2257 and we're left with 193.
Fetch the next digit (0) from the dividend, attach it to 193 and continue: 1930 / 258

Advancing to step 5:
The number 258 fits into 1930 7 times, leaving a remainder of 124.
Put 7 as the next digit of the answer. 
Result so far: 387.0
If we take 1806 away from 1930, we end up with 124.
Append the next digit (1) from the dividend to 124 and continue with: 1241 / 258

Advancing to step 6:
1241 divided by 258 is 4 with a remainder of 209.
Put 4 as the next digit of the answer. 
Result so far: 3874.0
Deduct 1032 from 1241 and we're left with 209.
Bring next digit (6) of the dividend behind the 209 and repeat the process: 2096 / 258

Advancing to step 7:
258 goes into 2096 8 times with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 38748.0
If we subtract 2064 from 2096, we get 32.
Fetch the next digit (5) from the dividend, attach it to 32 and continue: 325 / 258

Going ahead to step 8:
The number 258 fits into 325 1 times, leaving a remainder of 67.
Put 1 as the next digit of the answer. 
Result so far: 387481.0
If we take 258 away from 325, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Going ahead to step 9:
The number 258 fits into 670 2 times, leaving a remainder of 154.
Use 2 as the next digit of our solution. 
Result so far: 387481.2
If we take 516 away from 670, we end up with 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Advancing to step 10:
1540 divided by 258 is 5 with a remainder of 250.
Write down 5 as next digit of the result. 
Result so far: 387481.25
Deduct 1290 from 1540 and we're left with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Moving on to step 11:
258 goes into 2500 9 times with a remainder of 178.
Put 9 as the next digit of the answer. 
Result so far: 387481.259
If we subtract 2322 from 2500, we get 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

Going ahead to step 12:
The number 258 fits into 1780 6 times, leaving a remainder of 232.
The number 6 becomes the next digit in our result. 
Result so far: 387481.2596
Deduct 1548 from 1780 and we're left with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Let's proceed to step 13:
2320 divided by 258 is 8 with a remainder of 256.
Record the quotient 8 as the next digit in the result. 
Result so far: 387481.25968
Subtracting 2064 from 2320 leaves us with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Advancing to step 14:
The number 258 fits into 2560 9 times, leaving a remainder of 238.
Write down 9 as next digit of the result. 
Result so far: 387481.259689
Deduct 2322 from 2560 and we're left with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Let's proceed to step 15:
When dividing 2380 by 258, we get 9 with a remainder of 58.
The number 9 becomes the next digit in our result. 
Result so far: 387481.2596899
Deduct 2322 from 2380 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

In conclusion, the division gives 387481.2596899 with a balance of 5.8e-07.