653458 ÷ 21 
We want to figure out the number of times 653458 can be divided by 21.

Let's proceed to step 1:
21 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 21

On to step 2:
21 can be fit into 65 3 times, resulting in a remainder of 2.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 63 from 65 and we're left with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 21

On to step 3:
If we divide 23 by 21, we get 1 and a remainder of 2.
The next digit of our result is 1. 
Result so far: 31.0
The remainder is 2 after subtracting 21 from 23.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 21

On to step 4:
The number 21 fits into 24 1 times, leaving a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 311.0
If we subtract 21 from 24, we get 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 21

Moving on to step 5:
21 goes into 35 1 times with a remainder of 14.
The next digit of our result is 1. 
Result so far: 3111.0
Subtract 21 from 35 to get 14.
Append the next digit (8) from the dividend to 14 and continue with: 148 / 21

Moving on to step 6:
21 goes into 148 7 times with a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 31117.0
Deduct 147 from 148 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.

Let's proceed to step 7:
21 goes into 10 0 times with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 31117.0
Subtracting 0 from 10 leaves us 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.

Going ahead to step 8:
If we divide 100 by 21, we get 4 and a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 31117.04
Deduct 84 from 100 and we're left 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.

Going ahead to step 9:
If we divide 160 by 21, we get 7 and a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 31117.047
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.

Moving on to step 10:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 31117.0476
If we take 126 away from 130, 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.

Going ahead to step 11:
40 divided by 21 is 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 31117.04761
If we subtract 21 from 40, we 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.

Going ahead to step 12:
190 divided by 21 is 9 with a remainder of 1.
The next digit of our result is 9. 
Result so far: 31117.047619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 13:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 31117.047619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 14:
100 divided by 21 is 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 31117.04761904
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.

The final result is 31117.04761904 with a remainder of 1.6e-08.