We look at the division of 21900234 by 870 
Our goal is to divide 21900234 by 870.

Step 1:
The number 870 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 870

Moving on to step 2:
21 divided by 870 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Append the next digit (9) from the dividend to 21 and continue with: 219 / 870

Step 3:
219 divided by 870 is 0 with a remainder of 219.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 219, we end up with 219.
Grab the next digit (0) from the dividend, add it to 219, then carry on: 2190 / 870

Step 4:
If we divide 2190 by 870, we get 2 and a remainder of 450.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 1740 from 2190 to get 450.
Grab the next digit (0) from the dividend, add it to 450, then carry on: 4500 / 870

Advancing to step 5:
870 can be fit into 4500 5 times, resulting in a remainder of 150.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
Deduct 4350 from 4500 and we're left with 150.
Take the next digit (2) from the dividend and append it to 150, then repeat: 1502 / 870

Going ahead to step 6:
When dividing 1502 by 870, we get 1 with a remainder of 632.
Put 1 as the next digit of the answer. 
Result so far: 251.0
Subtract 870 from 1502 to get 632.
Fetch the next digit (3) from the dividend, attach it to 632 and continue: 6323 / 870

Moving on to step 7:
870 goes into 6323 7 times with a remainder of 233.
Put 7 as the next digit of the answer. 
Result so far: 2517.0
Subtract 6090 from 6323 to get 233.
Bring next digit (4) of the dividend behind the 233 and repeat the process: 2334 / 870

Advancing to step 8:
If we divide 2334 by 870, we get 2 and a remainder of 594.
Write down 2 as next digit of the result. 
Result so far: 25172.0
Deduct 1740 from 2334 and we're left with 594.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5940, and continue the process.

Moving on to step 9:
5940 divided by 870 is 6 with a remainder of 720.
Record the quotient 6 as the next digit in the result. 
Result so far: 25172.6
If we subtract 5220 from 5940, we get 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 10:
870 goes into 7200 8 times with a remainder of 240.
Write down 8 as next digit of the result. 
Result so far: 25172.68
The remainder is 240 after subtracting 6960 from 7200.
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 11:
If we divide 2400 by 870, we get 2 and a remainder of 660.
The next digit of our result is 2. 
Result so far: 25172.682
Subtract 1740 from 2400 to get 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6600, and continue the process.

On to step 12:
If we divide 6600 by 870, we get 7 and a remainder of 510.
Use 7 as the next digit of our solution. 
Result so far: 25172.6827
Subtract 6090 from 6600 to get 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Going ahead to step 13:
The number 870 fits into 5100 5 times, leaving a remainder of 750.
The next digit of our result is 5. 
Result so far: 25172.68275
Subtracting 4350 from 5100 leaves us with 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

On to step 14:
When dividing 7500 by 870, we get 8 with a remainder of 540.
Write down 8 as next digit of the result. 
Result so far: 25172.682758
Subtract 6960 from 7500 to get 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Advancing to step 15:
The number 870 fits into 5400 6 times, leaving a remainder of 180.
Record the quotient 6 as the next digit in the result. 
Result so far: 25172.6827586
The remainder is 180 after subtracting 5220 from 5400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Step 16:
870 can be fit into 1800 2 times, resulting in a remainder of 60.
Record the quotient 2 as the next digit in the result. 
Result so far: 25172.68275862
If we take 1740 away from 1800, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 25172.68275862 with a remainder of 6e-08.