258621 ÷ 45 
We want to figure out the number of times 258621 can be divided by 45.

Step 1:
2 divided by 45 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 45

On to step 2:
45 can be fit into 25 0 times, resulting in a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Fetch the next digit (8) from the dividend, attach it to 25 and continue: 258 / 45

Advancing to step 3:
258 divided by 45 is 5 with a remainder of 33.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 33 after subtracting 225 from 258.
Append the next digit (6) from the dividend to 33 and continue with: 336 / 45

Let's proceed to step 4:
45 goes into 336 7 times with a remainder of 21.
Record the quotient 7 as the next digit in the result. 
Result so far: 57.0
If we subtract 315 from 336, we get 21.
Fetch the next digit (2) from the dividend, attach it to 21 and continue: 212 / 45

On to step 5:
45 goes into 212 4 times with a remainder of 32.
Use 4 as the next digit of our solution. 
Result so far: 574.0
Subtracting 180 from 212 leaves us with 32.
Append the next digit (1) from the dividend to 32 and continue with: 321 / 45

Moving on to step 6:
When dividing 321 by 45, we get 7 with a remainder of 6.
The next digit of our result is 7. 
Result so far: 5747.0
Subtracting 315 from 321 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 7:
60 divided by 45 is 1 with a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 5747.1
Deduct 45 from 60 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 8:
The number 45 fits into 150 3 times, leaving a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 5747.13
Deduct 135 from 150 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 9:
45 goes into 150 3 times with a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 5747.133
If we take 135 away from 150, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 5747.133 with a remainder of 0.0015.