51511979 ÷ 604 
Let's see how many times 604 fits into 51511979.

Step 1:
If we divide 5 by 604, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 604

Advancing to step 2:
If we divide 51 by 604, we get 0 and 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.
Take the next digit (5) from the dividend and append it to 51, then repeat: 515 / 604

Step 3:
604 can be fit into 515 0 times, resulting in a remainder of 515.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 515, we end up with 515.
Append the next digit (1) from the dividend to 515 and continue with: 5151 / 604

Let's proceed to step 4:
If we divide 5151 by 604, we get 8 and a remainder of 319.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we subtract 4832 from 5151, we get 319.
Fetch the next digit (1) from the dividend, attach it to 319 and continue: 3191 / 604

Step 5:
604 goes into 3191 5 times with a remainder of 171.
Put 5 as the next digit of the answer. 
Result so far: 85.0
If we take 3020 away from 3191, we end up with 171.
Grab the next digit (9) from the dividend, add it to 171, then carry on: 1719 / 604

Let's proceed to step 6:
1719 divided by 604 is 2 with a remainder of 511.
The next digit of our result is 2. 
Result so far: 852.0
Deduct 1208 from 1719 and we're left with 511.
Take the next digit (7) from the dividend and append it to 511, then repeat: 5117 / 604

Going ahead to step 7:
The number 604 fits into 5117 8 times, leaving a remainder of 285.
Record the quotient 8 as the next digit in the result. 
Result so far: 8528.0
If we take 4832 away from 5117, we end up with 285.
Grab the next digit (9) from the dividend, add it to 285, then carry on: 2859 / 604

Advancing to step 8:
When dividing 2859 by 604, we get 4 with a remainder of 443.
Record the quotient 4 as the next digit in the result. 
Result so far: 85284.0
Deduct 2416 from 2859 and we're left with 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Going ahead to step 9:
4430 divided by 604 is 7 with a remainder of 202.
Write down 7 as next digit of the result. 
Result so far: 85284.7
Subtract 4228 from 4430 to get 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Moving on to step 10:
If we divide 2020 by 604, we get 3 and a remainder of 208.
Use 3 as the next digit of our solution. 
Result so far: 85284.73
If we subtract 1812 from 2020, we get 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Advancing to step 11:
The number 604 fits into 2080 3 times, leaving a remainder of 268.
Put 3 as the next digit of the answer. 
Result so far: 85284.733
If we subtract 1812 from 2080, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

After the division, we end up with 85284.733 and a remainder of 0.0268.