We're dividing 149043 by 45 
Our goal is to divide 149043 by 45.

On to step 1:
1 divided by 45 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 45

Advancing to step 2:
When dividing 14 by 45, we get 0 with a remainder of 14.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 14 after subtracting 0 from 14.
Append the next digit (9) from the dividend to 14 and continue with: 149 / 45

Advancing to step 3:
If we divide 149 by 45, we get 3 and a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 135 from 149 and we're left with 14.
Include the next digit (0) from the dividend after 14, then repeat: 140 / 45

Moving on to step 4:
The number 45 fits into 140 3 times, leaving a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 33.0
Subtracting 135 from 140 leaves us with 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 45

On to step 5:
The number 45 fits into 54 1 times, leaving a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 331.0
Deduct 45 from 54 and we're left with 9.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 45

On to step 6:
45 goes into 93 2 times with a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 3312.0
Subtracting 90 from 93 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
When dividing 30 by 45, we get 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 3312.0
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 8:
45 goes into 300 6 times with a remainder of 30.
Record the quotient 6 as the next digit in the result. 
Result so far: 3312.06
If we take 270 away from 300, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 9:
When dividing 300 by 45, we get 6 with a remainder of 30.
Use 6 as the next digit of our solution. 
Result so far: 3312.066
The remainder is 30 after subtracting 270 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 3312.066 with a remainder of 0.003.