We're dividing 51593124 by 400 
We want to figure out the number of times 51593124 can be divided by 400.

Moving on to step 1:
5 divided by 400 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 400

Let's proceed to step 2:
400 goes into 51 0 times with a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Grab the next digit (5) from the dividend, add it to 51, then carry on: 515 / 400

Moving on to step 3:
515 divided by 400 is 1 with a remainder of 115.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 115 after subtracting 400 from 515.
Fetch the next digit (9) from the dividend, attach it to 115 and continue: 1159 / 400

Advancing to step 4:
If we divide 1159 by 400, we get 2 and a remainder of 359.
Put 2 as the next digit of the answer. 
Result so far: 12.0
The remainder is 359 after subtracting 800 from 1159.
Include the next digit (3) from the dividend after 359, then repeat: 3593 / 400

Going ahead to step 5:
400 goes into 3593 8 times with a remainder of 393.
Record the quotient 8 as the next digit in the result. 
Result so far: 128.0
Subtract 3200 from 3593 to get 393.
Bring next digit (1) of the dividend behind the 393 and repeat the process: 3931 / 400

Going ahead to step 6:
3931 divided by 400 is 9 with a remainder of 331.
The next digit of our result is 9. 
Result so far: 1289.0
The remainder is 331 after subtracting 3600 from 3931.
Take the next digit (2) from the dividend and append it to 331, then repeat: 3312 / 400

Going ahead to step 7:
If we divide 3312 by 400, we get 8 and a remainder of 112.
The number 8 becomes the next digit in our result. 
Result so far: 12898.0
If we take 3200 away from 3312, we end up with 112.
Include the next digit (4) from the dividend after 112, then repeat: 1124 / 400

Going ahead to step 8:
400 goes into 1124 2 times with a remainder of 324.
Record the quotient 2 as the next digit in the result. 
Result so far: 128982.0
Deduct 800 from 1124 and we're left with 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

On to step 9:
When dividing 3240 by 400, we get 8 with a remainder of 40.
The number 8 becomes the next digit in our result. 
Result so far: 128982.8
Subtract 3200 from 3240 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 10:
400 divided by 400 is 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 128982.81
The remainder is 0 after subtracting 400 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 11:
0 divided by 400 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 128982.81
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 12:
If we divide 0 by 400, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 128982.81
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 128982.81, with a leftover of 0.0.