We divide 73843982 by 21
The aim is to understand the frequency of 21 in 73843982.

On to step 1:
7 divided by 21 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 21

Going ahead to step 2:
21 can be fit into 73 3 times, resulting in a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 63 from 73, we get 10.
Append the next digit (8) from the dividend to 10 and continue with: 108 / 21

Advancing to step 3:
If we divide 108 by 21, we get 5 and a remainder of 3.
Record the quotient 5 as the next digit in the result. 
Result so far: 35.0
The remainder is 3 after subtracting 105 from 108.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 21

Moving on to step 4:
34 divided by 21 is 1 with a remainder of 13.
The next digit of our result is 1. 
Result so far: 351.0
The remainder is 13 after subtracting 21 from 34.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 21

On to step 5:
21 can be fit into 133 6 times, resulting in a remainder of 7.
Write down 6 as next digit of the result. 
Result so far: 3516.0
If we subtract 126 from 133, we get 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 21

Going ahead to step 6:
21 can be fit into 79 3 times, resulting in a remainder of 16.
Record the quotient 3 as the next digit in the result. 
Result so far: 35163.0
If we take 63 away from 79, we end up with 16.
Take the next digit (8) from the dividend and append it to 16, then repeat: 168 / 21

Let's proceed to step 7:
168 divided by 21 is 8 with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 351638.0
If we subtract 168 from 168, we get 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 21

Advancing to step 8:
If we divide 2 by 21, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 3516380.0
If we take 0 away from 2, 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.

Step 9:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 3516380.0
Subtract 0 from 20 to get 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 10:
200 divided by 21 is 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 3516380.09
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 11:
When dividing 110 by 21, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 3516380.095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 12:
When dividing 50 by 21, we get 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 3516380.0952
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.

Moving on to step 13:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 3516380.09523
Deduct 63 from 80 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.

Moving on to step 14:
21 goes into 170 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 3516380.095238
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 15:
When dividing 20 by 21, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 3516380.095238
If we subtract 0 from 20, we get 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 16:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 3516380.09523809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

The quotient of the division is 3516380.09523809, and the remainder is 1.1e-08.