We're dividing 21890 by 79 
Let's see how many times 79 fits into 21890.

Moving on to step 1:
2 divided by 79 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 79

Going ahead to step 2:
79 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Fetch the next digit (8) from the dividend, attach it to 21 and continue: 218 / 79

Moving on to step 3:
79 can be fit into 218 2 times, resulting in a remainder of 60.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 158 away from 218, we end up with 60.
Include the next digit (9) from the dividend after 60, then repeat: 609 / 79

Advancing to step 4:
79 goes into 609 7 times with a remainder of 56.
Put 7 as the next digit of the answer. 
Result so far: 27.0
If we subtract 553 from 609, we get 56.
Include the next digit (0) from the dividend after 56, then repeat: 560 / 79

Step 5:
If we divide 560 by 79, we get 7 and a remainder of 7.
Write down 7 as next digit of the result. 
Result so far: 277.0
Deduct 553 from 560 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 6:
The number 79 fits into 70 0 times, leaving a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 277.0
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 7:
79 goes into 700 8 times with a remainder of 68.
The next digit of our result is 8. 
Result so far: 277.08
The remainder is 68 after subtracting 632 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

On to step 8:
680 divided by 79 is 8 with a remainder of 48.
Put 8 as the next digit of the answer. 
Result so far: 277.088
The remainder is 48 after subtracting 632 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

The final result is 277.088 with a remainder of 0.0048.