Let's divide 1521721 by 381
Let's see how many times 381 fits into 1521721.

On to step 1:
The number 381 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 381

On to step 2:
If we divide 15 by 381, we get 0 and a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Append the next digit (2) from the dividend to 15 and continue with: 152 / 381

Advancing to step 3:
The number 381 fits into 152 0 times, leaving a remainder of 152.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 152 leaves us with 152.
Include the next digit (1) from the dividend after 152, then repeat: 1521 / 381

Going ahead to step 4:
When dividing 1521 by 381, we get 3 with a remainder of 378.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 1143 from 1521 to get 378.
Append the next digit (7) from the dividend to 378 and continue with: 3787 / 381

On to step 5:
381 goes into 3787 9 times with a remainder of 358.
The next digit of our result is 9. 
Result so far: 39.0
If we take 3429 away from 3787, we end up with 358.
Grab the next digit (2) from the dividend, add it to 358, then carry on: 3582 / 381

Step 6:
3582 divided by 381 is 9 with a remainder of 153.
Use 9 as the next digit of our solution. 
Result so far: 399.0
If we subtract 3429 from 3582, we get 153.
Grab the next digit (1) from the dividend, add it to 153, then carry on: 1531 / 381

On to step 7:
381 can be fit into 1531 4 times, resulting in a remainder of 7.
The number 4 becomes the next digit in our result. 
Result so far: 3994.0
Subtracting 1524 from 1531 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 8:
The number 381 fits into 70 0 times, leaving a remainder of 70.
The next digit of our result is 0. 
Result so far: 3994.0
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 9:
700 divided by 381 is 1 with a remainder of 319.
Use 1 as the next digit of our solution. 
Result so far: 3994.01
The remainder is 319 after subtracting 381 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3190, and continue the process.

Going ahead to step 10:
The number 381 fits into 3190 8 times, leaving a remainder of 142.
Write down 8 as next digit of the result. 
Result so far: 3994.018
If we subtract 3048 from 3190, we get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Let's proceed to step 11:
381 goes into 1420 3 times with a remainder of 277.
The number 3 becomes the next digit in our result. 
Result so far: 3994.0183
Subtract 1143 from 1420 to get 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Advancing to step 12:
The number 381 fits into 2770 7 times, leaving a remainder of 103.
Write down 7 as next digit of the result. 
Result so far: 3994.01837
Subtract 2667 from 2770 to get 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Step 13:
381 can be fit into 1030 2 times, resulting in a remainder of 268.
Write down 2 as next digit of the result. 
Result so far: 3994.018372
Subtracting 762 from 1030 leaves us with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Let's proceed to step 14:
2680 divided by 381 is 7 with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 3994.0183727
If we take 2667 away from 2680, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 15:
381 goes into 130 0 times with a remainder of 130.
The next digit of our result is 0. 
Result so far: 3994.0183727
If we subtract 0 from 130, we get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

In conclusion, the division gives 3994.0183727 with a balance of 1.3e-07.