79939121 ÷ 420 
We want to divide 79939121 by 420.

Going ahead to step 1:
420 can be fit into 7 0 times, resulting in a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 420

Moving on to step 2:
420 goes into 79 0 times with a remainder of 79.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 79, we get 79.
Take the next digit (9) from the dividend and append it to 79, then repeat: 799 / 420

Moving on to step 3:
If we divide 799 by 420, we get 1 and a remainder of 379.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 379 after subtracting 420 from 799.
Bring next digit (3) of the dividend behind the 379 and repeat the process: 3793 / 420

On to step 4:
If we divide 3793 by 420, we get 9 and a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
Subtracting 3780 from 3793 leaves us with 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 420

Step 5:
420 can be fit into 139 0 times, resulting in a remainder of 139.
The next digit of our result is 0. 
Result so far: 190.0
If we take 0 away from 139, we end up with 139.
Fetch the next digit (1) from the dividend, attach it to 139 and continue: 1391 / 420

Let's proceed to step 6:
1391 divided by 420 is 3 with a remainder of 131.
Put 3 as the next digit of the answer. 
Result so far: 1903.0
Deduct 1260 from 1391 and we're left with 131.
Include the next digit (2) from the dividend after 131, then repeat: 1312 / 420

Let's proceed to step 7:
420 can be fit into 1312 3 times, resulting in a remainder of 52.
Write down 3 as next digit of the result. 
Result so far: 19033.0
Subtracting 1260 from 1312 leaves us with 52.
Bring next digit (1) of the dividend behind the 52 and repeat the process: 521 / 420

Moving on to step 8:
420 goes into 521 1 times with a remainder of 101.
Put 1 as the next digit of the answer. 
Result so far: 190331.0
Deduct 420 from 521 and we're left with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Advancing to step 9:
420 goes into 1010 2 times with a remainder of 170.
The next digit of our result is 2. 
Result so far: 190331.2
Subtracting 840 from 1010 leaves us with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Moving on to step 10:
420 goes into 1700 4 times with a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 190331.24
The remainder is 20 after subtracting 1680 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
The number 420 fits into 200 0 times, leaving a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 190331.24
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 12:
420 can be fit into 2000 4 times, resulting in a remainder of 320.
Use 4 as the next digit of our solution. 
Result so far: 190331.2404
If we subtract 1680 from 2000, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Let's proceed to step 13:
420 can be fit into 3200 7 times, resulting in a remainder of 260.
Write down 7 as next digit of the result. 
Result so far: 190331.24047
Deduct 2940 from 3200 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Let's proceed to step 14:
420 goes into 2600 6 times with a remainder of 80.
Use 6 as the next digit of our solution. 
Result so far: 190331.240476
Subtract 2520 from 2600 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 15:
420 can be fit into 800 1 times, resulting in a remainder of 380.
Write down 1 as next digit of the result. 
Result so far: 190331.2404761
The remainder is 380 after subtracting 420 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Advancing to step 16:
3800 divided by 420 is 9 with a remainder of 20.
Write down 9 as next digit of the result. 
Result so far: 190331.24047619
Deduct 3780 from 3800 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 190331.24047619 with a remainder of 2e-08.