We look at the division of 372669 by 21 
Let's see how many times 21 fits into 372669.

Going ahead to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Take the next digit (7) from the dividend and append it to 3, then repeat: 37 / 21

Moving on to step 2:
If we divide 37 by 21, we get 1 and a remainder of 16.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 21 from 37 to get 16.
Take the next digit (2) from the dividend and append it to 16, then repeat: 162 / 21

Moving on to step 3:
21 can be fit into 162 7 times, resulting in a remainder of 15.
Use 7 as the next digit of our solution. 
Result so far: 17.0
If we take 147 away from 162, we end up with 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 21

Let's proceed to step 4:
21 can be fit into 156 7 times, resulting in a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 177.0
Subtracting 147 from 156 leaves us with 9.
Include the next digit (6) from the dividend after 9, then repeat: 96 / 21

Going ahead to step 5:
96 divided by 21 is 4 with a remainder of 12.
The next digit of our result is 4. 
Result so far: 1774.0
Deduct 84 from 96 and we're left with 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 21

Let's proceed to step 6:
21 goes into 129 6 times with a remainder of 3.
The next digit of our result is 6. 
Result so far: 17746.0
If we subtract 126 from 129, 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.

Let's proceed to step 7:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 17746.1
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 8:
If we divide 90 by 21, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 17746.14
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 17746.142
Subtracting 42 from 60 leaves us 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 10:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 17746.1428
Deduct 168 from 180 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 11:
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: 17746.14285
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 12:
If we divide 150 by 21, we get 7 and a remainder of 3.
The next digit of our result is 7. 
Result so far: 17746.142857
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 13:
21 goes into 30 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 17746.1428571
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.

Going ahead to step 14:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 17746.14285714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final outcome is 17746.14285714, with a leftover of 6e-09.