We're dividing 645186 by 30 
Our goal is to divide 645186 by 30.

On to step 1:
6 divided by 30 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 30

Let's proceed to step 2:
64 divided by 30 is 2 with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 60 from 64 to get 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 30

Moving on to step 3:
30 goes into 45 1 times with a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Deduct 30 from 45 and we're left with 15.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 30

On to step 4:
When dividing 151 by 30, we get 5 with a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 215.0
Subtracting 150 from 151 leaves us with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 30

Going ahead to step 5:
If we divide 18 by 30, we get 0 and a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 2150.0
If we subtract 0 from 18, we get 18.
Append the next digit (6) from the dividend to 18 and continue with: 186 / 30

Advancing to step 6:
186 divided by 30 is 6 with a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 21506.0
If we take 180 away from 186, we end up 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.

Step 7:
60 divided by 30 is 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 21506.2
Subtract 60 from 60 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
30 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 21506.2
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
30 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 21506.2
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 21506.2, with a leftover of 0.0.