644973 ÷ 4 
We're looking to find how many times 4 goes into 644973.

Moving on to step 1:
6 divided by 4 is 1 with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 4 from 6, we get 2.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 4

Let's proceed to step 2:
If we divide 24 by 4, we get 6 and a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 16.0
If we take 24 away from 24, we end up with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 4

Moving on to step 3:
If we divide 4 by 4, we get 1 and a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 161.0
Subtracting 4 from 4 leaves us with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 4

Advancing to step 4:
The number 4 fits into 9 2 times, leaving a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 1612.0
Subtracting 8 from 9 leaves us with 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 4

Let's proceed to step 5:
If we divide 17 by 4, we get 4 and a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 16124.0
If we take 16 away from 17, we end up with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 4

Going ahead to step 6:
When dividing 13 by 4, we get 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 161243.0
Subtracting 12 from 13 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
When dividing 10 by 4, we get 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 161243.2
Deduct 8 from 10 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
20 divided by 4 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 161243.25
Subtract 20 from 20 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.

Step 9:
If we divide 0 by 4, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 161243.25
Subtract 0 from 0 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.

Moving on to step 10:
When dividing 0 by 4, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 161243.25
If we subtract 0 from 0, we 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.

After the division, we end up with 161243.25 and a remainder of 0.0.