We look at the division of 161843 by 21 
We want to figure out the number of times 161843 can be divided by 21.

Moving on to step 1:
1 divided by 21 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 21

Advancing to step 2:
21 can be fit into 16 0 times, resulting in a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Take the next digit (1) from the dividend and append it to 16, then repeat: 161 / 21

Moving on to step 3:
The number 21 fits into 161 7 times, leaving a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 7.0
The remainder is 14 after subtracting 147 from 161.
Grab the next digit (8) from the dividend, add it to 14, then carry on: 148 / 21

Step 4:
The number 21 fits into 148 7 times, leaving a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 77.0
Subtracting 147 from 148 leaves us with 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 21

Going ahead to step 5:
If we divide 14 by 21, we get 0 and a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 770.0
Subtracting 0 from 14 leaves us with 14.
Grab the next digit (3) from the dividend, add it to 14, then carry on: 143 / 21

Moving on to step 6:
21 can be fit into 143 6 times, resulting in a remainder of 17.
Write down 6 as next digit of the result. 
Result so far: 7706.0
Deduct 126 from 143 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 7:
If we divide 170 by 21, we get 8 and a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 7706.8
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
20 divided by 21 is 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 7706.8
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
When dividing 200 by 21, we get 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 7706.809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 10:
If we divide 110 by 21, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 7706.8095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 11:
50 divided by 21 is 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 7706.80952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 12:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 7706.809523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 13:
When dividing 170 by 21, we get 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 7706.8095238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 14:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 7706.8095238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 7706.8095238 with a remainder of 2e-08.