386990 ÷ 45 
We're looking to find how many times 45 goes into 386990.

Let's proceed to step 1:
If we divide 3 by 45, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 45

Step 2:
45 can be fit into 38 0 times, resulting in a remainder of 38.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 38, we get 38.
Fetch the next digit (6) from the dividend, attach it to 38 and continue: 386 / 45

Advancing to step 3:
The number 45 fits into 386 8 times, leaving a remainder of 26.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 360 from 386 and we're left with 26.
Append the next digit (9) from the dividend to 26 and continue with: 269 / 45

On to step 4:
269 divided by 45 is 5 with a remainder of 44.
Write down 5 as next digit of the result. 
Result so far: 85.0
Deduct 225 from 269 and we're left with 44.
Fetch the next digit (9) from the dividend, attach it to 44 and continue: 449 / 45

Let's proceed to step 5:
The number 45 fits into 449 9 times, leaving a remainder of 44.
Use 9 as the next digit of our solution. 
Result so far: 859.0
The remainder is 44 after subtracting 405 from 449.
Include the next digit (0) from the dividend after 44, then repeat: 440 / 45

Advancing to step 6:
45 can be fit into 440 9 times, resulting in a remainder of 35.
The next digit of our result is 9. 
Result so far: 8599.0
The remainder is 35 after subtracting 405 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 7:
45 can be fit into 350 7 times, resulting in a remainder of 35.
Record the quotient 7 as the next digit in the result. 
Result so far: 8599.7
The remainder is 35 after subtracting 315 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 8:
45 can be fit into 350 7 times, resulting in a remainder of 35.
The number 7 becomes the next digit in our result. 
Result so far: 8599.77
Deduct 315 from 350 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final outcome is 8599.77, with a leftover of 0.035.