We look at the division of 18531443 by 420 
We want to figure out the number of times 18531443 can be divided by 420.

On to step 1:
1 divided by 420 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 420

Going ahead to step 2:
420 can be fit into 18 0 times, resulting in a remainder of 18.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 18 leaves us with 18.
Take the next digit (5) from the dividend and append it to 18, then repeat: 185 / 420

Going ahead to step 3:
The number 420 fits into 185 0 times, leaving a remainder of 185.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 185, we end up with 185.
Fetch the next digit (3) from the dividend, attach it to 185 and continue: 1853 / 420

Moving on to step 4:
1853 divided by 420 is 4 with a remainder of 173.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 1680 from 1853, we get 173.
Grab the next digit (1) from the dividend, add it to 173, then carry on: 1731 / 420

Step 5:
420 goes into 1731 4 times with a remainder of 51.
Use 4 as the next digit of our solution. 
Result so far: 44.0
The remainder is 51 after subtracting 1680 from 1731.
Grab the next digit (4) from the dividend, add it to 51, then carry on: 514 / 420

Advancing to step 6:
If we divide 514 by 420, we get 1 and a remainder of 94.
The number 1 becomes the next digit in our result. 
Result so far: 441.0
Deduct 420 from 514 and we're left with 94.
Append the next digit (4) from the dividend to 94 and continue with: 944 / 420

Step 7:
944 divided by 420 is 2 with a remainder of 104.
Put 2 as the next digit of the answer. 
Result so far: 4412.0
If we subtract 840 from 944, we get 104.
Grab the next digit (3) from the dividend, add it to 104, then carry on: 1043 / 420

Moving on to step 8:
If we divide 1043 by 420, we get 2 and a remainder of 203.
Record the quotient 2 as the next digit in the result. 
Result so far: 44122.0
The remainder is 203 after subtracting 840 from 1043.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2030, and continue the process.

On to step 9:
The number 420 fits into 2030 4 times, leaving a remainder of 350.
The next digit of our result is 4. 
Result so far: 44122.4
If we take 1680 away from 2030, we end up with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

On to step 10:
If we divide 3500 by 420, we get 8 and a remainder of 140.
Write down 8 as next digit of the result. 
Result so far: 44122.48
If we subtract 3360 from 3500, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Moving on to step 11:
When dividing 1400 by 420, we get 3 with a remainder of 140.
The number 3 becomes the next digit in our result. 
Result so far: 44122.483
Deduct 1260 from 1400 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 12:
420 goes into 1400 3 times with a remainder of 140.
Write down 3 as next digit of the result. 
Result so far: 44122.4833
If we take 1260 away from 1400, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

The final outcome is 44122.4833, with a leftover of 0.0014.