We divide 51691609 by 4
We want to divide 51691609 by 4.

Step 1:
5 divided by 4 is 1 with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 4 from 5 to get 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 4

Advancing to step 2:
If we divide 11 by 4, we get 2 and a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtract 8 from 11 to get 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 4

Going ahead to step 3:
4 goes into 36 9 times with a remainder of 0.
The next digit of our result is 9. 
Result so far: 129.0
Subtract 36 from 36 to get 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 4

Let's proceed to step 4:
If we divide 9 by 4, we get 2 and a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 1292.0
Subtracting 8 from 9 leaves us with 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 4

Going ahead to step 5:
If we divide 11 by 4, we get 2 and a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 12922.0
Deduct 8 from 11 and we're left with 3.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 4

Going ahead to step 6:
36 divided by 4 is 9 with a remainder of 0.
Write down 9 as next digit of the result. 
Result so far: 129229.0
Deduct 36 from 36 and we're left with 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 4

Step 7:
When dividing 0 by 4, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1292290.0
Subtract 0 from 0 to get 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 4

Step 8:
4 goes into 9 2 times with a remainder of 1.
The next digit of our result is 2. 
Result so far: 12922902.0
If we subtract 8 from 9, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 9:
The number 4 fits into 10 2 times, leaving a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 12922902.2
Subtract 8 from 10 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
20 divided by 4 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 12922902.25
Deduct 20 from 20 and we're left 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.

Moving on to step 11:
4 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 12922902.25
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.

Let's proceed to step 12:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 12922902.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 12922902.25 with a remaining 0.0.