16151422 ÷ 409 
Our goal is to divide 16151422 by 409.

Let's proceed to step 1:
If we divide 1 by 409, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 409

Advancing to step 2:
When dividing 16 by 409, we get 0 with a remainder of 16.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 16 leaves us with 16.
Take the next digit (1) from the dividend and append it to 16, then repeat: 161 / 409

Step 3:
409 can be fit into 161 0 times, resulting in a remainder of 161.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 161 after subtracting 0 from 161.
Include the next digit (5) from the dividend after 161, then repeat: 1615 / 409

Let's proceed to step 4:
409 can be fit into 1615 3 times, resulting in a remainder of 388.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 388 after subtracting 1227 from 1615.
Take the next digit (1) from the dividend and append it to 388, then repeat: 3881 / 409

Step 5:
3881 divided by 409 is 9 with a remainder of 200.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
Subtract 3681 from 3881 to get 200.
Append the next digit (4) from the dividend to 200 and continue with: 2004 / 409

Moving on to step 6:
2004 divided by 409 is 4 with a remainder of 368.
Write down 4 as next digit of the result. 
Result so far: 394.0
If we take 1636 away from 2004, we end up with 368.
Grab the next digit (2) from the dividend, add it to 368, then carry on: 3682 / 409

Let's proceed to step 7:
When dividing 3682 by 409, we get 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 3949.0
If we take 3681 away from 3682, we end up with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 409

Moving on to step 8:
12 divided by 409 is 0 with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 39490.0
The remainder is 12 after subtracting 0 from 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
409 goes into 120 0 times with a remainder of 120.
The number 0 becomes the next digit in our result. 
Result so far: 39490.0
Subtract 0 from 120 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 10:
1200 divided by 409 is 2 with a remainder of 382.
Use 2 as the next digit of our solution. 
Result so far: 39490.02
If we subtract 818 from 1200, we get 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

Step 11:
If we divide 3820 by 409, we get 9 and a remainder of 139.
The number 9 becomes the next digit in our result. 
Result so far: 39490.029
Deduct 3681 from 3820 and we're left with 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

Let's proceed to step 12:
When dividing 1390 by 409, we get 3 with a remainder of 163.
Write down 3 as next digit of the result. 
Result so far: 39490.0293
If we take 1227 away from 1390, we end up with 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Advancing to step 13:
409 can be fit into 1630 3 times, resulting in a remainder of 403.
The number 3 becomes the next digit in our result. 
Result so far: 39490.02933
Subtracting 1227 from 1630 leaves us with 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4030, and continue the process.

The final result is 39490.02933 with a remainder of 0.000403.