We divide 56239380 by 21
The aim is to understand the frequency of 21 in 56239380.

On to step 1:
21 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (6) from the dividend and append it to 5, then repeat: 56 / 21

Going ahead to step 2:
21 can be fit into 56 2 times, resulting in a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 42 away from 56, we end up with 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 21

Step 3:
21 goes into 142 6 times with a remainder of 16.
Use 6 as the next digit of our solution. 
Result so far: 26.0
Subtracting 126 from 142 leaves us with 16.
Bring next digit (3) of the dividend behind the 16 and repeat the process: 163 / 21

On to step 4:
21 can be fit into 163 7 times, resulting in a remainder of 16.
Record the quotient 7 as the next digit in the result. 
Result so far: 267.0
Deduct 147 from 163 and we're left with 16.
Fetch the next digit (9) from the dividend, attach it to 16 and continue: 169 / 21

Step 5:
169 divided by 21 is 8 with a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 2678.0
If we take 168 away from 169, we end up with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 21

Step 6:
The number 21 fits into 13 0 times, leaving a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 26780.0
Subtract 0 from 13 to get 13.
Grab the next digit (8) from the dividend, add it to 13, then carry on: 138 / 21

Advancing to step 7:
21 goes into 138 6 times with a remainder of 12.
The next digit of our result is 6. 
Result so far: 267806.0
If we subtract 126 from 138, we get 12.
Append the next digit (0) from the dividend to 12 and continue with: 120 / 21

Moving on to step 8:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 2678065.0
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 9:
If we divide 150 by 21, we get 7 and a remainder of 3.
The next digit of our result is 7. 
Result so far: 2678065.7
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
21 goes into 30 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 2678065.71
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 11:
21 goes into 90 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 2678065.714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 12:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 2678065.7142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 13:
When dividing 180 by 21, we get 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 2678065.71428
Deduct 168 from 180 and we're left with 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 14:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 2678065.714285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 15:
When dividing 150 by 21, we get 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 2678065.7142857
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 16:
When dividing 30 by 21, we get 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 2678065.71428571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Our division results in 2678065.71428571 with a remaining 9e-09.