Let's divide 51246739 by 21
Our goal is to divide 51246739 by 21.

Let's proceed to step 1:
When dividing 5 by 21, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 21

Moving on to step 2:
The number 21 fits into 51 2 times, leaving a remainder of 9.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 42 from 51 and we're left with 9.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 21

Advancing to step 3:
21 goes into 92 4 times with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 24.0
If we take 84 away from 92, we end up with 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 21

Advancing to step 4:
21 goes into 84 4 times with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 244.0
If we take 84 away from 84, we end up with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 21

Advancing to step 5:
If we divide 6 by 21, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 2440.0
Subtract 0 from 6 to get 6.
Bring next digit (7) of the dividend behind the 6 and repeat the process: 67 / 21

Moving on to step 6:
When dividing 67 by 21, we get 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 24403.0
The remainder is 4 after subtracting 63 from 67.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 21

Moving on to step 7:
43 divided by 21 is 2 with a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 244032.0
Subtract 42 from 43 to get 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 21

Let's proceed to step 8:
19 divided by 21 is 0 with a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 2440320.0
Deduct 0 from 19 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.

Step 9:
When dividing 190 by 21, we get 9 with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 2440320.9
Deduct 189 from 190 and we're left 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.

Advancing to step 10:
21 can be fit into 10 0 times, resulting in a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 2440320.9
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 11:
21 goes into 100 4 times with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 2440320.904
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 12:
21 goes into 160 7 times with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 2440320.9047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 13:
130 divided by 21 is 6 with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 2440320.90476
Deduct 126 from 130 and we're left 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.

Step 14:
If we divide 40 by 21, we get 1 and a remainder of 19.
The next digit of our result is 1. 
Result so far: 2440320.904761
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.

Advancing to step 15:
190 divided by 21 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 2440320.9047619
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.

Let's proceed to step 16:
When dividing 10 by 21, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 2440320.9047619
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.

Our division results in 2440320.9047619 with a remaining 1e-08.