We look at the division of 142522 by 21 
We're looking to find how many times 21 goes into 142522.

Moving on to step 1:
21 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 21

Going ahead to step 2:
14 divided by 21 is 0 with a remainder of 14.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 14, we get 14.
Fetch the next digit (2) from the dividend, attach it to 14 and continue: 142 / 21

Advancing to step 3:
21 goes into 142 6 times with a remainder of 16.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we subtract 126 from 142, we get 16.
Fetch the next digit (5) from the dividend, attach it to 16 and continue: 165 / 21

Advancing to step 4:
The number 21 fits into 165 7 times, leaving a remainder of 18.
Record the quotient 7 as the next digit in the result. 
Result so far: 67.0
If we subtract 147 from 165, we get 18.
Take the next digit (2) from the dividend and append it to 18, then repeat: 182 / 21

On to step 5:
21 goes into 182 8 times with a remainder of 14.
Put 8 as the next digit of the answer. 
Result so far: 678.0
If we subtract 168 from 182, we get 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 21

Moving on to step 6:
When dividing 142 by 21, we get 6 with a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 6786.0
If we subtract 126 from 142, we 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.

Moving on to step 7:
160 divided by 21 is 7 with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 6786.7
If we take 147 away from 160, we end up with 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 8:
When dividing 130 by 21, we get 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 6786.76
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 6786.761
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.

Let's proceed to step 10:
190 divided by 21 is 9 with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 6786.7619
If we take 189 away from 190, we end up 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 11:
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: 6786.7619
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.

Step 12:
If we divide 100 by 21, we get 4 and a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 6786.761904
If we subtract 84 from 100, we 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.

Advancing to step 13:
When dividing 160 by 21, we get 7 with a remainder of 13.
The next digit of our result is 7. 
Result so far: 6786.7619047
If we take 147 away from 160, we end up with 13.
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 14:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 6786.76190476
Subtracting 126 from 130 leaves us 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.

The final outcome is 6786.76190476, with a leftover of 4e-09.