We're dividing 644680 by 30 
We want to figure out the number of times 644680 can be divided by 30.

Step 1:
The number 30 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 30

Going ahead to step 2:
The number 30 fits into 64 2 times, leaving a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 60 away from 64, we end up with 4.
Bring next digit (4) of the dividend behind the 4 and repeat the process: 44 / 30

Moving on to step 3:
If we divide 44 by 30, we get 1 and a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
Deduct 30 from 44 and we're left with 14.
Grab the next digit (6) from the dividend, add it to 14, then carry on: 146 / 30

Let's proceed to step 4:
When dividing 146 by 30, we get 4 with a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 214.0
Deduct 120 from 146 and we're left with 26.
Append the next digit (8) from the dividend to 26 and continue with: 268 / 30

Going ahead to step 5:
The number 30 fits into 268 8 times, leaving a remainder of 28.
Record the quotient 8 as the next digit in the result. 
Result so far: 2148.0
Deduct 240 from 268 and we're left with 28.
Bring next digit (0) of the dividend behind the 28 and repeat the process: 280 / 30

Advancing to step 6:
When dividing 280 by 30, we get 9 with a remainder of 10.
Write down 9 as next digit of the result. 
Result so far: 21489.0
Subtract 270 from 280 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 7:
30 goes into 100 3 times with a remainder of 10.
Put 3 as the next digit of the answer. 
Result so far: 21489.3
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
100 divided by 30 is 3 with a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 21489.33
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 21489.33 with a balance of 0.01.