279669 ÷ 21 
We're looking to find how many times 21 goes into 279669.

Let's proceed to step 1:
The number 21 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (7) from the dividend after 2, then repeat: 27 / 21

Going ahead to step 2:
If we divide 27 by 21, we get 1 and a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 21 from 27, we get 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 21

Moving on to step 3:
21 can be fit into 69 3 times, resulting in a remainder of 6.
The next digit of our result is 3. 
Result so far: 13.0
If we take 63 away from 69, we end up with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 21

Going ahead to step 4:
21 can be fit into 66 3 times, resulting in a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 133.0
Subtract 63 from 66 to get 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 21

Moving on to step 5:
36 divided by 21 is 1 with a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 1331.0
Subtracting 21 from 36 leaves us with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 21

Let's proceed to step 6:
The number 21 fits into 159 7 times, leaving a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 13317.0
Deduct 147 from 159 and we're left 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 7:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 13317.5
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 8:
If we divide 150 by 21, we get 7 and a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 13317.57
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.

Let's proceed to step 9:
When dividing 30 by 21, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 13317.571
Subtracting 21 from 30 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.

Step 10:
21 goes into 90 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 13317.5714
Subtracting 84 from 90 leaves us 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.

Let's proceed to step 11:
21 goes into 60 2 times with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 13317.57142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 12:
21 goes into 180 8 times with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 13317.571428
If we take 168 away from 180, we end up 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.

Moving on to step 13:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 13317.5714285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 14:
150 divided by 21 is 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 13317.57142857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Our division results in 13317.57142857 with a remaining 3e-09.