We're dividing 51815156 by 669 
Our goal is to divide 51815156 by 669.

Let's proceed to step 1:
If we divide 5 by 669, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 669

Moving on to step 2:
If we divide 51 by 669, we get 0 and a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Fetch the next digit (8) from the dividend, attach it to 51 and continue: 518 / 669

Moving on to step 3:
669 goes into 518 0 times with a remainder of 518.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 518, we end up with 518.
Append the next digit (1) from the dividend to 518 and continue with: 5181 / 669

Let's proceed to step 4:
If we divide 5181 by 669, we get 7 and a remainder of 498.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 4683 from 5181 to get 498.
Include the next digit (5) from the dividend after 498, then repeat: 4985 / 669

Advancing to step 5:
669 can be fit into 4985 7 times, resulting in a remainder of 302.
Put 7 as the next digit of the answer. 
Result so far: 77.0
Subtracting 4683 from 4985 leaves us with 302.
Append the next digit (1) from the dividend to 302 and continue with: 3021 / 669

Step 6:
When dividing 3021 by 669, we get 4 with a remainder of 345.
Put 4 as the next digit of the answer. 
Result so far: 774.0
If we subtract 2676 from 3021, we get 345.
Grab the next digit (5) from the dividend, add it to 345, then carry on: 3455 / 669

Advancing to step 7:
When dividing 3455 by 669, we get 5 with a remainder of 110.
Record the quotient 5 as the next digit in the result. 
Result so far: 7745.0
Subtract 3345 from 3455 to get 110.
Fetch the next digit (6) from the dividend, attach it to 110 and continue: 1106 / 669

On to step 8:
669 goes into 1106 1 times with a remainder of 437.
Put 1 as the next digit of the answer. 
Result so far: 77451.0
Subtracting 669 from 1106 leaves us with 437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4370, and continue the process.

Step 9:
4370 divided by 669 is 6 with a remainder of 356.
Write down 6 as next digit of the result. 
Result so far: 77451.6
If we take 4014 away from 4370, we end up with 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

Advancing to step 10:
If we divide 3560 by 669, we get 5 and a remainder of 215.
The number 5 becomes the next digit in our result. 
Result so far: 77451.65
If we take 3345 away from 3560, we end up with 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Going ahead to step 11:
669 can be fit into 2150 3 times, resulting in a remainder of 143.
The next digit of our result is 3. 
Result so far: 77451.653
Subtract 2007 from 2150 to get 143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

On to step 12:
The number 669 fits into 1430 2 times, leaving a remainder of 92.
Record the quotient 2 as the next digit in the result. 
Result so far: 77451.6532
Subtracting 1338 from 1430 leaves us with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Step 13:
669 goes into 920 1 times with a remainder of 251.
Put 1 as the next digit of the answer. 
Result so far: 77451.65321
The remainder is 251 after subtracting 669 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2510, and continue the process.

Advancing to step 14:
The number 669 fits into 2510 3 times, leaving a remainder of 503.
Record the quotient 3 as the next digit in the result. 
Result so far: 77451.653213
Subtract 2007 from 2510 to get 503.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5030, and continue the process.

Step 15:
5030 divided by 669 is 7 with a remainder of 347.
The number 7 becomes the next digit in our result. 
Result so far: 77451.6532137
Subtract 4683 from 5030 to get 347.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3470, and continue the process.

Step 16:
669 goes into 3470 5 times with a remainder of 125.
Put 5 as the next digit of the answer. 
Result so far: 77451.65321375
Subtracting 3345 from 3470 leaves us with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

In conclusion, the division gives 77451.65321375 with a balance of 1.25e-07.