We look at the division of 42870973 by 420 
Our goal is to divide 42870973 by 420.

Advancing to step 1:
The number 420 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 420

Moving on to step 2:
42 divided by 420 is 0 with a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 42, we get 42.
Take the next digit (8) from the dividend and append it to 42, then repeat: 428 / 420

Moving on to step 3:
If we divide 428 by 420, we get 1 and a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 8 after subtracting 420 from 428.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 420

Let's proceed to step 4:
If we divide 87 by 420, we get 0 and a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 87 to get 87.
Append the next digit (0) from the dividend to 87 and continue with: 870 / 420

On to step 5:
The number 420 fits into 870 2 times, leaving a remainder of 30.
The number 2 becomes the next digit in our result. 
Result so far: 102.0
The remainder is 30 after subtracting 840 from 870.
Take the next digit (9) from the dividend and append it to 30, then repeat: 309 / 420

Let's proceed to step 6:
420 goes into 309 0 times with a remainder of 309.
The next digit of our result is 0. 
Result so far: 1020.0
If we take 0 away from 309, we end up with 309.
Grab the next digit (7) from the dividend, add it to 309, then carry on: 3097 / 420

On to step 7:
The number 420 fits into 3097 7 times, leaving a remainder of 157.
The number 7 becomes the next digit in our result. 
Result so far: 10207.0
Subtracting 2940 from 3097 leaves us with 157.
Grab the next digit (3) from the dividend, add it to 157, then carry on: 1573 / 420

On to step 8:
420 can be fit into 1573 3 times, resulting in a remainder of 313.
Record the quotient 3 as the next digit in the result. 
Result so far: 102073.0
If we take 1260 away from 1573, we end up with 313.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3130, and continue the process.

Moving on to step 9:
420 can be fit into 3130 7 times, resulting in a remainder of 190.
Put 7 as the next digit of the answer. 
Result so far: 102073.7
If we subtract 2940 from 3130, we get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Moving on to step 10:
The number 420 fits into 1900 4 times, leaving a remainder of 220.
Use 4 as the next digit of our solution. 
Result so far: 102073.74
Subtracting 1680 from 1900 leaves us with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 11:
If we divide 2200 by 420, we get 5 and a remainder of 100.
Use 5 as the next digit of our solution. 
Result so far: 102073.745
Subtracting 2100 from 2200 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 12:
If we divide 1000 by 420, we get 2 and a remainder of 160.
Write down 2 as next digit of the result. 
Result so far: 102073.7452
Subtract 840 from 1000 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Going ahead to step 13:
The number 420 fits into 1600 3 times, leaving a remainder of 340.
The number 3 becomes the next digit in our result. 
Result so far: 102073.74523
Subtracting 1260 from 1600 leaves us with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Advancing to step 14:
If we divide 3400 by 420, we get 8 and a remainder of 40.
Write down 8 as next digit of the result. 
Result so far: 102073.745238
If we take 3360 away from 3400, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 15:
When dividing 400 by 420, we get 0 with a remainder of 400.
Write down 0 as next digit of the result. 
Result so far: 102073.745238
The remainder is 400 after subtracting 0 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 16:
4000 divided by 420 is 9 with a remainder of 220.
Write down 9 as next digit of the result. 
Result so far: 102073.74523809
If we subtract 3780 from 4000, we get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

The final result is 102073.74523809 with a remainder of 2.2e-07.