3918902 divided by 420 
We want to figure out the number of times 3918902 can be divided by 420.

Moving on to step 1:
420 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 420

Going ahead to step 2:
39 divided by 420 is 0 with a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Bring next digit (1) of the dividend behind the 39 and repeat the process: 391 / 420

Moving on to step 3:
420 goes into 391 0 times with a remainder of 391.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 391 and we're left with 391.
Bring next digit (8) of the dividend behind the 391 and repeat the process: 3918 / 420

Advancing to step 4:
If we divide 3918 by 420, we get 9 and a remainder of 138.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtract 3780 from 3918 to get 138.
Include the next digit (9) from the dividend after 138, then repeat: 1389 / 420

Let's proceed to step 5:
When dividing 1389 by 420, we get 3 with a remainder of 129.
The number 3 becomes the next digit in our result. 
Result so far: 93.0
Subtracting 1260 from 1389 leaves us with 129.
Include the next digit (0) from the dividend after 129, then repeat: 1290 / 420

Moving on to step 6:
420 goes into 1290 3 times with a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 933.0
Deduct 1260 from 1290 and we're left with 30.
Take the next digit (2) from the dividend and append it to 30, then repeat: 302 / 420

On to step 7:
When dividing 302 by 420, we get 0 with a remainder of 302.
Write down 0 as next digit of the result. 
Result so far: 9330.0
Subtracting 0 from 302 leaves us with 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Step 8:
The number 420 fits into 3020 7 times, leaving a remainder of 80.
The next digit of our result is 7. 
Result so far: 9330.7
The remainder is 80 after subtracting 2940 from 3020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 9:
The number 420 fits into 800 1 times, leaving a remainder of 380.
Write down 1 as next digit of the result. 
Result so far: 9330.71
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.

Going ahead to step 10:
3800 divided by 420 is 9 with a remainder of 20.
Put 9 as the next digit of the answer. 
Result so far: 9330.719
If we take 3780 away from 3800, we end up 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.

Moving on to step 11:
200 divided by 420 is 0 with a remainder of 200.
The next digit of our result is 0. 
Result so far: 9330.719
If we take 0 away from 200, we end up 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.

Let's proceed to step 12:
The number 420 fits into 2000 4 times, leaving a remainder of 320.
The number 4 becomes the next digit in our result. 
Result so far: 9330.71904
Subtract 1680 from 2000 to 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.

On to step 13:
If we divide 3200 by 420, we get 7 and a remainder of 260.
Put 7 as the next digit of the answer. 
Result so far: 9330.719047
If we subtract 2940 from 3200, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 14:
If we divide 2600 by 420, we get 6 and a remainder of 80.
Record the quotient 6 as the next digit in the result. 
Result so far: 9330.7190476
If we subtract 2520 from 2600, we 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.

Going ahead to step 15:
420 goes into 800 1 times with a remainder of 380.
Use 1 as the next digit of our solution. 
Result so far: 9330.71904761
Subtracting 420 from 800 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

The final outcome is 9330.71904761, with a leftover of 3.8e-07.