We're dividing 131615 by 21 
Our goal is to divide 131615 by 21.

On to step 1:
The number 21 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 21

Step 2:
21 goes into 13 0 times with a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Append the next digit (1) from the dividend to 13 and continue with: 131 / 21

Advancing to step 3:
The number 21 fits into 131 6 times, leaving a remainder of 5.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we subtract 126 from 131, we get 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 21

Let's proceed to step 4:
The number 21 fits into 56 2 times, leaving a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 62.0
The remainder is 14 after subtracting 42 from 56.
Include the next digit (1) from the dividend after 14, then repeat: 141 / 21

Let's proceed to step 5:
21 can be fit into 141 6 times, resulting in a remainder of 15.
Use 6 as the next digit of our solution. 
Result so far: 626.0
If we take 126 away from 141, we end up with 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 21

Moving on to step 6:
The number 21 fits into 155 7 times, leaving a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 6267.0
If we take 147 away from 155, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
If we divide 80 by 21, we get 3 and a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 6267.3
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 8:
If we divide 170 by 21, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 6267.38
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 9:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 6267.38
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 10:
21 goes into 200 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 6267.3809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 11:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 6267.38095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 12:
50 divided by 21 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 6267.380952
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 13:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 6267.3809523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 14:
170 divided by 21 is 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 6267.38095238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The quotient of the division is 6267.38095238, and the remainder is 2e-09.