654345 ÷ 21 
Our goal is to divide 654345 by 21.

Going ahead to step 1:
The number 21 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 21

Going ahead to step 2:
21 goes into 65 3 times with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 63 from 65 leaves us with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 21

Moving on to step 3:
If we divide 24 by 21, we get 1 and a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
Deduct 21 from 24 and we're left with 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 21

Step 4:
21 can be fit into 33 1 times, resulting in a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 311.0
Subtract 21 from 33 to get 12.
Fetch the next digit (4) from the dividend, attach it to 12 and continue: 124 / 21

Advancing to step 5:
21 goes into 124 5 times with a remainder of 19.
Write down 5 as next digit of the result. 
Result so far: 3115.0
Deduct 105 from 124 and we're left with 19.
Bring next digit (5) of the dividend behind the 19 and repeat the process: 195 / 21

Advancing to step 6:
21 can be fit into 195 9 times, resulting in a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 31159.0
If we take 189 away from 195, we end up 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.

Moving on to step 7:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 31159.2
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 8:
If we divide 180 by 21, we get 8 and a remainder of 12.
The next digit of our result is 8. 
Result so far: 31159.28
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 9:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 31159.285
Subtracting 105 from 120 leaves us 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.

Let's proceed to step 10:
21 goes into 150 7 times with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 31159.2857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 11:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 31159.28571
Subtracting 21 from 30 leaves us 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.

Let's proceed to step 12:
When dividing 90 by 21, we get 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 31159.285714
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.

Advancing to step 13:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 31159.2857142
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 14:
21 goes into 180 8 times with a remainder of 12.
The next digit of our result is 8. 
Result so far: 31159.28571428
If we take 168 away from 180, we end up 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.

The final outcome is 31159.28571428, with a leftover of 1.2e-08.