Let's divide 1561233 by 840
We want to figure out the number of times 1561233 can be divided by 840.

On to step 1:
1 divided by 840 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 840

Step 2:
840 can be fit into 15 0 times, resulting in a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Append the next digit (6) from the dividend to 15 and continue with: 156 / 840

Going ahead to step 3:
If we divide 156 by 840, we get 0 and a remainder of 156.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 156 leaves us with 156.
Bring next digit (1) of the dividend behind the 156 and repeat the process: 1561 / 840

Going ahead to step 4:
840 goes into 1561 1 times with a remainder of 721.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 721 after subtracting 840 from 1561.
Bring next digit (2) of the dividend behind the 721 and repeat the process: 7212 / 840

Going ahead to step 5:
7212 divided by 840 is 8 with a remainder of 492.
Write down 8 as next digit of the result. 
Result so far: 18.0
The remainder is 492 after subtracting 6720 from 7212.
Append the next digit (3) from the dividend to 492 and continue with: 4923 / 840

Moving on to step 6:
840 goes into 4923 5 times with a remainder of 723.
The next digit of our result is 5. 
Result so far: 185.0
Subtracting 4200 from 4923 leaves us with 723.
Grab the next digit (3) from the dividend, add it to 723, then carry on: 7233 / 840

Moving on to step 7:
7233 divided by 840 is 8 with a remainder of 513.
The next digit of our result is 8. 
Result so far: 1858.0
If we take 6720 away from 7233, we end up with 513.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5130, and continue the process.

Let's proceed to step 8:
840 goes into 5130 6 times with a remainder of 90.
Write down 6 as next digit of the result. 
Result so far: 1858.6
Deduct 5040 from 5130 and we're left with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Moving on to step 9:
900 divided by 840 is 1 with a remainder of 60.
Put 1 as the next digit of the answer. 
Result so far: 1858.61
If we subtract 840 from 900, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 10:
840 goes into 600 0 times with a remainder of 600.
Write down 0 as next digit of the result. 
Result so far: 1858.61
Subtracting 0 from 600 leaves us with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

On to step 11:
840 goes into 6000 7 times with a remainder of 120.
Record the quotient 7 as the next digit in the result. 
Result so far: 1858.6107
If we subtract 5880 from 6000, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 12:
840 goes into 1200 1 times with a remainder of 360.
The number 1 becomes the next digit in our result. 
Result so far: 1858.61071
Subtract 840 from 1200 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

On to step 13:
If we divide 3600 by 840, we get 4 and a remainder of 240.
Use 4 as the next digit of our solution. 
Result so far: 1858.610714
Subtracting 3360 from 3600 leaves us with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Moving on to step 14:
840 goes into 2400 2 times with a remainder of 720.
Record the quotient 2 as the next digit in the result. 
Result so far: 1858.6107142
Subtracting 1680 from 2400 leaves us with 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7200, and continue the process.

Advancing to step 15:
840 goes into 7200 8 times with a remainder of 480.
Record the quotient 8 as the next digit in the result. 
Result so far: 1858.61071428
Subtract 6720 from 7200 to get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

The final outcome is 1858.61071428, with a leftover of 4.8e-07.