375369 ÷ 21 
Let's see how many times 21 fits into 375369.

Let's proceed to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 21

Moving on to step 2:
21 goes into 37 1 times with a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 16 after subtracting 21 from 37.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 21

Moving on to step 3:
165 divided by 21 is 7 with a remainder of 18.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we subtract 147 from 165, we get 18.
Grab the next digit (3) from the dividend, add it to 18, then carry on: 183 / 21

Step 4:
The number 21 fits into 183 8 times, leaving a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 178.0
If we take 168 away from 183, we end up with 15.
Grab the next digit (6) from the dividend, add it to 15, then carry on: 156 / 21

Step 5:
21 can be fit into 156 7 times, resulting in a remainder of 9.
The next digit of our result is 7. 
Result so far: 1787.0
If we subtract 147 from 156, we get 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 21

Let's proceed to step 6:
99 divided by 21 is 4 with a remainder of 15.
Write down 4 as next digit of the result. 
Result so far: 17874.0
Subtracting 84 from 99 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.

Let's proceed to step 7:
21 can be fit into 150 7 times, resulting in a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 17874.7
Subtract 147 from 150 to 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.

Advancing to step 8:
If we divide 30 by 21, we get 1 and a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 17874.71
If we take 21 away from 30, 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 9:
21 goes into 90 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 17874.714
Subtract 84 from 90 to 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.

On to step 10:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 17874.7142
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.

Step 11:
If we divide 180 by 21, we get 8 and a remainder of 12.
The next digit of our result is 8. 
Result so far: 17874.71428
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.

Let's proceed to step 12:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 17874.714285
Deduct 105 from 120 and we're left 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.

Moving on to step 13:
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: 17874.7142857
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 14:
If we divide 30 by 21, we get 1 and a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 17874.71428571
Deduct 21 from 30 and we're left 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.

The quotient of the division is 17874.71428571, and the remainder is 9e-09.