278742 ÷ 21 
We're looking to find how many times 21 goes into 278742.

Moving on to step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 21

Going ahead to step 2:
21 can be fit into 27 1 times, resulting in a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 21 from 27 to get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 21

Moving on to step 3:
When dividing 68 by 21, we get 3 with a remainder of 5.
The next digit of our result is 3. 
Result so far: 13.0
Deduct 63 from 68 and we're left with 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 21

Step 4:
21 can be fit into 57 2 times, resulting in a remainder of 15.
Put 2 as the next digit of the answer. 
Result so far: 132.0
The remainder is 15 after subtracting 42 from 57.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 21

Moving on to step 5:
If we divide 154 by 21, we get 7 and a remainder of 7.
Use 7 as the next digit of our solution. 
Result so far: 1327.0
The remainder is 7 after subtracting 147 from 154.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 21

Going ahead to step 6:
72 divided by 21 is 3 with a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 13273.0
Subtracting 63 from 72 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 13273.4
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 8:
21 goes into 60 2 times with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 13273.42
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 9:
If we divide 180 by 21, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 13273.428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 10:
21 goes into 120 5 times with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 13273.4285
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 11:
When dividing 150 by 21, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 13273.42857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 12:
21 goes into 30 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 13273.428571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 13:
If we divide 90 by 21, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 13273.4285714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
If we divide 60 by 21, we get 2 and a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 13273.42857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The quotient of the division is 13273.42857142, and the remainder is 1.8e-08.