Let's divide 373368 by 21
We're looking to find how many times 21 goes into 373368.

Going ahead to step 1:
21 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 21

Going ahead to step 2:
21 goes into 37 1 times with a remainder of 16.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 21 from 37 and we're left with 16.
Fetch the next digit (3) from the dividend, attach it to 16 and continue: 163 / 21

Let's proceed to step 3:
The number 21 fits into 163 7 times, leaving a remainder of 16.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
The remainder is 16 after subtracting 147 from 163.
Append the next digit (3) from the dividend to 16 and continue with: 163 / 21

Step 4:
21 goes into 163 7 times with a remainder of 16.
Put 7 as the next digit of the answer. 
Result so far: 177.0
The remainder is 16 after subtracting 147 from 163.
Append the next digit (6) from the dividend to 16 and continue with: 166 / 21

Going ahead to step 5:
21 goes into 166 7 times with a remainder of 19.
Put 7 as the next digit of the answer. 
Result so far: 1777.0
Deduct 147 from 166 and we're left with 19.
Take the next digit (8) from the dividend and append it to 19, then repeat: 198 / 21

Moving on to step 6:
21 can be fit into 198 9 times, resulting in a remainder of 9.
The next digit of our result is 9. 
Result so far: 17779.0
If we take 189 away from 198, we end up 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 7:
90 divided by 21 is 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 17779.4
If we take 84 away from 90, we end up 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.

Moving on to step 8:
60 divided by 21 is 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 17779.42
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.

On to step 9:
If we divide 180 by 21, we get 8 and a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 17779.428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 10:
If we divide 120 by 21, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 17779.4285
Subtracting 105 from 120 leaves us with 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 11:
21 goes into 150 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 17779.42857
Deduct 147 from 150 and we're left 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.

Let's proceed to step 12:
When dividing 30 by 21, we get 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 17779.428571
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 13:
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: 17779.4285714
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.

Step 14:
When dividing 60 by 21, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 17779.42857142
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.

After the division, we end up with 17779.42857142 and a remainder of 1.8e-08.