We're dividing 51624789 by 638 
We want to figure out the number of times 51624789 can be divided by 638.

On to step 1:
5 divided by 638 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 638

Moving on to step 2:
When dividing 51 by 638, we get 0 with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Take the next digit (6) from the dividend and append it to 51, then repeat: 516 / 638

Step 3:
638 goes into 516 0 times with a remainder of 516.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 516, we end up with 516.
Take the next digit (2) from the dividend and append it to 516, then repeat: 5162 / 638

Step 4:
638 goes into 5162 8 times with a remainder of 58.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 5104 from 5162 leaves us with 58.
Fetch the next digit (4) from the dividend, attach it to 58 and continue: 584 / 638

Moving on to step 5:
584 divided by 638 is 0 with a remainder of 584.
Use 0 as the next digit of our solution. 
Result so far: 80.0
If we take 0 away from 584, we end up with 584.
Append the next digit (7) from the dividend to 584 and continue with: 5847 / 638

Going ahead to step 6:
638 goes into 5847 9 times with a remainder of 105.
The number 9 becomes the next digit in our result. 
Result so far: 809.0
The remainder is 105 after subtracting 5742 from 5847.
Append the next digit (8) from the dividend to 105 and continue with: 1058 / 638

Going ahead to step 7:
If we divide 1058 by 638, we get 1 and a remainder of 420.
Record the quotient 1 as the next digit in the result. 
Result so far: 8091.0
If we take 638 away from 1058, we end up with 420.
Take the next digit (9) from the dividend and append it to 420, then repeat: 4209 / 638

Going ahead to step 8:
4209 divided by 638 is 6 with a remainder of 381.
Write down 6 as next digit of the result. 
Result so far: 80916.0
Deduct 3828 from 4209 and we're left with 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Going ahead to step 9:
638 goes into 3810 5 times with a remainder of 620.
The number 5 becomes the next digit in our result. 
Result so far: 80916.5
The remainder is 620 after subtracting 3190 from 3810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Let's proceed to step 10:
638 goes into 6200 9 times with a remainder of 458.
Write down 9 as next digit of the result. 
Result so far: 80916.59
Subtracting 5742 from 6200 leaves us with 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

Moving on to step 11:
638 goes into 4580 7 times with a remainder of 114.
Record the quotient 7 as the next digit in the result. 
Result so far: 80916.597
Subtracting 4466 from 4580 leaves us with 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

On to step 12:
1140 divided by 638 is 1 with a remainder of 502.
Put 1 as the next digit of the answer. 
Result so far: 80916.5971
The remainder is 502 after subtracting 638 from 1140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5020, and continue the process.

Going ahead to step 13:
If we divide 5020 by 638, we get 7 and a remainder of 554.
The number 7 becomes the next digit in our result. 
Result so far: 80916.59717
If we take 4466 away from 5020, we end up with 554.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

Moving on to step 14:
The number 638 fits into 5540 8 times, leaving a remainder of 436.
Record the quotient 8 as the next digit in the result. 
Result so far: 80916.597178
Deduct 5104 from 5540 and we're left with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Moving on to step 15:
The number 638 fits into 4360 6 times, leaving a remainder of 532.
Use 6 as the next digit of our solution. 
Result so far: 80916.5971786
Deduct 3828 from 4360 and we're left with 532.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

Advancing to step 16:
If we divide 5320 by 638, we get 8 and a remainder of 216.
The number 8 becomes the next digit in our result. 
Result so far: 80916.59717868
If we take 5104 away from 5320, we end up with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

After the division, we end up with 80916.59717868 and a remainder of 2.16e-07.