3100621 ÷ 825 
Let's see how many times 825 fits into 3100621.

Step 1:
825 can be fit into 3 0 times, resulting in a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 825

Going ahead to step 2:
If we divide 31 by 825, we get 0 and a remainder of 31.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 31 after subtracting 0 from 31.
Fetch the next digit (0) from the dividend, attach it to 31 and continue: 310 / 825

Let's proceed to step 3:
825 can be fit into 310 0 times, resulting in a remainder of 310.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 310, we get 310.
Grab the next digit (0) from the dividend, add it to 310, then carry on: 3100 / 825

Let's proceed to step 4:
3100 divided by 825 is 3 with a remainder of 625.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we subtract 2475 from 3100, we get 625.
Append the next digit (6) from the dividend to 625 and continue with: 6256 / 825

Advancing to step 5:
825 can be fit into 6256 7 times, resulting in a remainder of 481.
Use 7 as the next digit of our solution. 
Result so far: 37.0
If we take 5775 away from 6256, we end up with 481.
Grab the next digit (2) from the dividend, add it to 481, then carry on: 4812 / 825

On to step 6:
When dividing 4812 by 825, we get 5 with a remainder of 687.
Record the quotient 5 as the next digit in the result. 
Result so far: 375.0
Subtract 4125 from 4812 to get 687.
Append the next digit (1) from the dividend to 687 and continue with: 6871 / 825

On to step 7:
The number 825 fits into 6871 8 times, leaving a remainder of 271.
Write down 8 as next digit of the result. 
Result so far: 3758.0
The remainder is 271 after subtracting 6600 from 6871.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

Let's proceed to step 8:
825 goes into 2710 3 times with a remainder of 235.
Write down 3 as next digit of the result. 
Result so far: 3758.3
Deduct 2475 from 2710 and we're left with 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Let's proceed to step 9:
825 can be fit into 2350 2 times, resulting in a remainder of 700.
Record the quotient 2 as the next digit in the result. 
Result so far: 3758.32
Subtract 1650 from 2350 to get 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Advancing to step 10:
825 can be fit into 7000 8 times, resulting in a remainder of 400.
Write down 8 as next digit of the result. 
Result so far: 3758.328
Subtract 6600 from 7000 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 11:
825 can be fit into 4000 4 times, resulting in a remainder of 700.
The number 4 becomes the next digit in our result. 
Result so far: 3758.3284
If we take 3300 away from 4000, we end up with 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Moving on to step 12:
If we divide 7000 by 825, we get 8 and a remainder of 400.
Write down 8 as next digit of the result. 
Result so far: 3758.32848
If we take 6600 away from 7000, we end up with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 13:
The number 825 fits into 4000 4 times, leaving a remainder of 700.
Put 4 as the next digit of the answer. 
Result so far: 3758.328484
Subtracting 3300 from 4000 leaves us with 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Advancing to step 14:
7000 divided by 825 is 8 with a remainder of 400.
The next digit of our result is 8. 
Result so far: 3758.3284848
Subtracting 6600 from 7000 leaves us with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Step 15:
4000 divided by 825 is 4 with a remainder of 700.
Put 4 as the next digit of the answer. 
Result so far: 3758.32848484
If we subtract 3300 from 4000, we get 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

The final outcome is 3758.32848484, with a leftover of 7e-07.