We divide 3912130 by 210
We want to figure out the number of times 3912130 can be divided by 210.

On to step 1:
3 divided by 210 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 210

Going ahead to step 2:
210 goes into 39 0 times with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Grab the next digit (1) from the dividend, add it to 39, then carry on: 391 / 210

On to step 3:
If we divide 391 by 210, we get 1 and a remainder of 181.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 181 after subtracting 210 from 391.
Take the next digit (2) from the dividend and append it to 181, then repeat: 1812 / 210

Going ahead to step 4:
If we divide 1812 by 210, we get 8 and a remainder of 132.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
Subtract 1680 from 1812 to get 132.
Append the next digit (1) from the dividend to 132 and continue with: 1321 / 210

On to step 5:
210 can be fit into 1321 6 times, resulting in a remainder of 61.
Put 6 as the next digit of the answer. 
Result so far: 186.0
Subtracting 1260 from 1321 leaves us with 61.
Grab the next digit (3) from the dividend, add it to 61, then carry on: 613 / 210

Step 6:
If we divide 613 by 210, we get 2 and a remainder of 193.
Put 2 as the next digit of the answer. 
Result so far: 1862.0
If we subtract 420 from 613, we get 193.
Grab the next digit (0) from the dividend, add it to 193, then carry on: 1930 / 210

Let's proceed to step 7:
If we divide 1930 by 210, we get 9 and a remainder of 40.
The number 9 becomes the next digit in our result. 
Result so far: 18629.0
If we subtract 1890 from 1930, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
When dividing 400 by 210, we get 1 with a remainder of 190.
Record the quotient 1 as the next digit in the result. 
Result so far: 18629.1
If we subtract 210 from 400, 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 9:
210 can be fit into 1900 9 times, resulting in a remainder of 10.
The next digit of our result is 9. 
Result so far: 18629.19
Subtracting 1890 from 1900 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
The number 210 fits into 100 0 times, leaving a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 18629.19
If we subtract 0 from 100, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 11:
210 can be fit into 1000 4 times, resulting in a remainder of 160.
Use 4 as the next digit of our solution. 
Result so far: 18629.1904
If we take 840 away from 1000, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 12:
The number 210 fits into 1600 7 times, leaving a remainder of 130.
The next digit of our result is 7. 
Result so far: 18629.19047
If we take 1470 away from 1600, we end up with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Moving on to step 13:
210 can be fit into 1300 6 times, resulting in a remainder of 40.
The number 6 becomes the next digit in our result. 
Result so far: 18629.190476
If we take 1260 away from 1300, 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.

On to step 14:
210 goes into 400 1 times with a remainder of 190.
The next digit of our result is 1. 
Result so far: 18629.1904761
If we take 210 away from 400, we end up with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Going ahead to step 15:
When dividing 1900 by 210, we get 9 with a remainder of 10.
The next digit of our result is 9. 
Result so far: 18629.19047619
Subtracting 1890 from 1900 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 18629.19047619 with a remainder of 1e-08.