72123218 ÷ 258 
We want to figure out the number of times 72123218 can be divided by 258.

Let's proceed to step 1:
258 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 258

Advancing to step 2:
258 can be fit into 72 0 times, resulting in a remainder of 72.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 72, we end up with 72.
Bring next digit (1) of the dividend behind the 72 and repeat the process: 721 / 258

Going ahead to step 3:
258 can be fit into 721 2 times, resulting in a remainder of 205.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 516 from 721 to get 205.
Bring next digit (2) of the dividend behind the 205 and repeat the process: 2052 / 258

Going ahead to step 4:
2052 divided by 258 is 7 with a remainder of 246.
Use 7 as the next digit of our solution. 
Result so far: 27.0
Subtracting 1806 from 2052 leaves us with 246.
Append the next digit (3) from the dividend to 246 and continue with: 2463 / 258

Let's proceed to step 5:
When dividing 2463 by 258, we get 9 with a remainder of 141.
Use 9 as the next digit of our solution. 
Result so far: 279.0
Subtracting 2322 from 2463 leaves us with 141.
Include the next digit (2) from the dividend after 141, then repeat: 1412 / 258

Advancing to step 6:
The number 258 fits into 1412 5 times, leaving a remainder of 122.
Use 5 as the next digit of our solution. 
Result so far: 2795.0
Deduct 1290 from 1412 and we're left with 122.
Take the next digit (1) from the dividend and append it to 122, then repeat: 1221 / 258

Advancing to step 7:
The number 258 fits into 1221 4 times, leaving a remainder of 189.
Use 4 as the next digit of our solution. 
Result so far: 27954.0
Deduct 1032 from 1221 and we're left with 189.
Append the next digit (8) from the dividend to 189 and continue with: 1898 / 258

Step 8:
When dividing 1898 by 258, we get 7 with a remainder of 92.
The next digit of our result is 7. 
Result so far: 279547.0
If we subtract 1806 from 1898, we get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Advancing to step 9:
The number 258 fits into 920 3 times, leaving a remainder of 146.
The number 3 becomes the next digit in our result. 
Result so far: 279547.3
The remainder is 146 after subtracting 774 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Step 10:
When dividing 1460 by 258, we get 5 with a remainder of 170.
Record the quotient 5 as the next digit in the result. 
Result so far: 279547.35
Subtracting 1290 from 1460 leaves us with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Going ahead to step 11:
The number 258 fits into 1700 6 times, leaving a remainder of 152.
Use 6 as the next digit of our solution. 
Result so far: 279547.356
If we take 1548 away from 1700, we end up with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Advancing to step 12:
258 can be fit into 1520 5 times, resulting in a remainder of 230.
Record the quotient 5 as the next digit in the result. 
Result so far: 279547.3565
Deduct 1290 from 1520 and we're left with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Going ahead to step 13:
2300 divided by 258 is 8 with a remainder of 236.
Use 8 as the next digit of our solution. 
Result so far: 279547.35658
The remainder is 236 after subtracting 2064 from 2300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Step 14:
258 can be fit into 2360 9 times, resulting in a remainder of 38.
The next digit of our result is 9. 
Result so far: 279547.356589
If we subtract 2322 from 2360, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 15:
258 goes into 380 1 times with a remainder of 122.
The next digit of our result is 1. 
Result so far: 279547.3565891
Subtracting 258 from 380 leaves us with 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

On to step 16:
258 goes into 1220 4 times with a remainder of 188.
Record the quotient 4 as the next digit in the result. 
Result so far: 279547.35658914
Deduct 1032 from 1220 and we're left with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

In conclusion, the division gives 279547.35658914 with a balance of 1.88e-07.