We're dividing 64921873 by 258 
We want to figure out the number of times 64921873 can be divided by 258.

Going ahead to step 1:
258 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 258

Advancing to step 2:
When dividing 64 by 258, we get 0 with a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Grab the next digit (9) from the dividend, add it to 64, then carry on: 649 / 258

Let's proceed to step 3:
When dividing 649 by 258, we get 2 with a remainder of 133.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 516 from 649 to get 133.
Grab the next digit (2) from the dividend, add it to 133, then carry on: 1332 / 258

Let's proceed to step 4:
1332 divided by 258 is 5 with a remainder of 42.
Use 5 as the next digit of our solution. 
Result so far: 25.0
If we subtract 1290 from 1332, we get 42.
Grab the next digit (1) from the dividend, add it to 42, then carry on: 421 / 258

Going ahead to step 5:
If we divide 421 by 258, we get 1 and a remainder of 163.
Write down 1 as next digit of the result. 
Result so far: 251.0
Subtract 258 from 421 to get 163.
Append the next digit (8) from the dividend to 163 and continue with: 1638 / 258

Advancing to step 6:
If we divide 1638 by 258, we get 6 and a remainder of 90.
The next digit of our result is 6. 
Result so far: 2516.0
If we take 1548 away from 1638, we end up with 90.
Take the next digit (7) from the dividend and append it to 90, then repeat: 907 / 258

Moving on to step 7:
If we divide 907 by 258, we get 3 and a remainder of 133.
Put 3 as the next digit of the answer. 
Result so far: 25163.0
Subtract 774 from 907 to get 133.
Fetch the next digit (3) from the dividend, attach it to 133 and continue: 1333 / 258

Going ahead to step 8:
258 goes into 1333 5 times with a remainder of 43.
Record the quotient 5 as the next digit in the result. 
Result so far: 251635.0
If we take 1290 away from 1333, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 9:
258 goes into 430 1 times with a remainder of 172.
Write down 1 as next digit of the result. 
Result so far: 251635.1
Deduct 258 from 430 and we're left with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Step 10:
258 can be fit into 1720 6 times, resulting in a remainder of 172.
Put 6 as the next digit of the answer. 
Result so far: 251635.16
If we subtract 1548 from 1720, we get 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Let's proceed to step 11:
When dividing 1720 by 258, we get 6 with a remainder of 172.
Record the quotient 6 as the next digit in the result. 
Result so far: 251635.166
If we subtract 1548 from 1720, we get 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

The final result is 251635.166 with a remainder of 0.0172.