We divide 739876 by 21
The aim is to understand the frequency of 21 in 739876.

Moving on to step 1:
7 divided by 21 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 21

Advancing to step 2:
73 divided by 21 is 3 with a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 63 away from 73, we end up with 10.
Include the next digit (9) from the dividend after 10, then repeat: 109 / 21

Let's proceed to step 3:
21 goes into 109 5 times with a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
If we subtract 105 from 109, we get 4.
Append the next digit (8) from the dividend to 4 and continue with: 48 / 21

Going ahead to step 4:
48 divided by 21 is 2 with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 352.0
If we take 42 away from 48, we end up with 6.
Bring next digit (7) of the dividend behind the 6 and repeat the process: 67 / 21

Going ahead to step 5:
The number 21 fits into 67 3 times, leaving a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 3523.0
If we take 63 away from 67, we end up with 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 21

Step 6:
If we divide 46 by 21, we get 2 and a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 35232.0
If we take 42 away from 46, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
21 can be fit into 40 1 times, resulting in a remainder of 19.
The next digit of our result is 1. 
Result so far: 35232.1
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 8:
If we divide 190 by 21, we get 9 and a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 35232.19
Subtracting 189 from 190 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 9:
When dividing 10 by 21, we get 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 35232.19
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
21 can be fit into 100 4 times, resulting in a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 35232.1904
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 11:
When dividing 160 by 21, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 35232.19047
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 12:
21 goes into 130 6 times with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 35232.190476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 13:
If we divide 40 by 21, we get 1 and a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 35232.1904761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 14:
If we divide 190 by 21, we get 9 and a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 35232.19047619
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final outcome is 35232.19047619, with a leftover of 1e-09.