77321522 ÷ 621 
We want to divide 77321522 by 621.

On to step 1:
When dividing 7 by 621, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 621

Let's proceed to step 2:
When dividing 77 by 621, we get 0 with a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 77, we end up with 77.
Bring next digit (3) of the dividend behind the 77 and repeat the process: 773 / 621

On to step 3:
If we divide 773 by 621, we get 1 and a remainder of 152.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 621 from 773 to get 152.
Fetch the next digit (2) from the dividend, attach it to 152 and continue: 1522 / 621

Going ahead to step 4:
The number 621 fits into 1522 2 times, leaving a remainder of 280.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtract 1242 from 1522 to get 280.
Fetch the next digit (1) from the dividend, attach it to 280 and continue: 2801 / 621

Moving on to step 5:
If we divide 2801 by 621, we get 4 and a remainder of 317.
Use 4 as the next digit of our solution. 
Result so far: 124.0
Subtract 2484 from 2801 to get 317.
Bring next digit (5) of the dividend behind the 317 and repeat the process: 3175 / 621

Step 6:
When dividing 3175 by 621, we get 5 with a remainder of 70.
Write down 5 as next digit of the result. 
Result so far: 1245.0
Deduct 3105 from 3175 and we're left with 70.
Take the next digit (2) from the dividend and append it to 70, then repeat: 702 / 621

Moving on to step 7:
621 can be fit into 702 1 times, resulting in a remainder of 81.
Write down 1 as next digit of the result. 
Result so far: 12451.0
If we subtract 621 from 702, we get 81.
Include the next digit (2) from the dividend after 81, then repeat: 812 / 621

Step 8:
812 divided by 621 is 1 with a remainder of 191.
The next digit of our result is 1. 
Result so far: 124511.0
If we take 621 away from 812, we end up with 191.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1910, and continue the process.

Moving on to step 9:
1910 divided by 621 is 3 with a remainder of 47.
The next digit of our result is 3. 
Result so far: 124511.3
Subtract 1863 from 1910 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 10:
470 divided by 621 is 0 with a remainder of 470.
The next digit of our result is 0. 
Result so far: 124511.3
If we subtract 0 from 470, we get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Moving on to step 11:
621 goes into 4700 7 times with a remainder of 353.
Use 7 as the next digit of our solution. 
Result so far: 124511.307
If we subtract 4347 from 4700, we get 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

Step 12:
3530 divided by 621 is 5 with a remainder of 425.
The number 5 becomes the next digit in our result. 
Result so far: 124511.3075
Subtracting 3105 from 3530 leaves us with 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Moving on to step 13:
If we divide 4250 by 621, we get 6 and a remainder of 524.
Record the quotient 6 as the next digit in the result. 
Result so far: 124511.30756
If we take 3726 away from 4250, we end up with 524.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5240, and continue the process.

Going ahead to step 14:
When dividing 5240 by 621, we get 8 with a remainder of 272.
Put 8 as the next digit of the answer. 
Result so far: 124511.307568
Deduct 4968 from 5240 and we're left with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Let's proceed to step 15:
When dividing 2720 by 621, we get 4 with a remainder of 236.
The number 4 becomes the next digit in our result. 
Result so far: 124511.3075684
Subtract 2484 from 2720 to get 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Let's proceed to step 16:
The number 621 fits into 2360 3 times, leaving a remainder of 497.
Use 3 as the next digit of our solution. 
Result so far: 124511.30756843
Subtract 1863 from 2360 to get 497.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

After the division, we end up with 124511.30756843 and a remainder of 4.97e-07.