We're dividing 148407 by 21 
We want to divide 148407 by 21.

On to step 1:
If we divide 1 by 21, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 21

Moving on to step 2:
14 divided by 21 is 0 with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 14, we end up with 14.
Fetch the next digit (8) from the dividend, attach it to 14 and continue: 148 / 21

Moving on to step 3:
If we divide 148 by 21, we get 7 and a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we take 147 away from 148, we end up with 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 21

On to step 4:
14 divided by 21 is 0 with a remainder of 14.
The next digit of our result is 0. 
Result so far: 70.0
If we subtract 0 from 14, we get 14.
Bring next digit (0) of the dividend behind the 14 and repeat the process: 140 / 21

Let's proceed to step 5:
140 divided by 21 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 706.0
If we subtract 126 from 140, we get 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 21

Going ahead to step 6:
When dividing 147 by 21, we get 7 with a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 7067.0
If we take 147 away from 147, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
21 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7067.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
21 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 7067.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 7067.0, with a leftover of 0.0.