6378390 ÷ 620 
We want to divide 6378390 by 620.

Going ahead to step 1:
6 divided by 620 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 620

Advancing to step 2:
If we divide 63 by 620, we get 0 and a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 63 and we're left with 63.
Grab the next digit (7) from the dividend, add it to 63, then carry on: 637 / 620

Going ahead to step 3:
If we divide 637 by 620, we get 1 and a remainder of 17.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 17 after subtracting 620 from 637.
Append the next digit (8) from the dividend to 17 and continue with: 178 / 620

Advancing to step 4:
178 divided by 620 is 0 with a remainder of 178.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 178 leaves us with 178.
Grab the next digit (3) from the dividend, add it to 178, then carry on: 1783 / 620

Going ahead to step 5:
When dividing 1783 by 620, we get 2 with a remainder of 543.
Write down 2 as next digit of the result. 
Result so far: 102.0
Deduct 1240 from 1783 and we're left with 543.
Include the next digit (9) from the dividend after 543, then repeat: 5439 / 620

Moving on to step 6:
620 can be fit into 5439 8 times, resulting in a remainder of 479.
Record the quotient 8 as the next digit in the result. 
Result so far: 1028.0
Subtracting 4960 from 5439 leaves us with 479.
Append the next digit (0) from the dividend to 479 and continue with: 4790 / 620

Advancing to step 7:
If we divide 4790 by 620, we get 7 and a remainder of 450.
The number 7 becomes the next digit in our result. 
Result so far: 10287.0
Subtract 4340 from 4790 to get 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Let's proceed to step 8:
The number 620 fits into 4500 7 times, leaving a remainder of 160.
Record the quotient 7 as the next digit in the result. 
Result so far: 10287.7
If we take 4340 away from 4500, 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.

Let's proceed to step 9:
If we divide 1600 by 620, we get 2 and a remainder of 360.
Use 2 as the next digit of our solution. 
Result so far: 10287.72
Subtract 1240 from 1600 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 10:
If we divide 3600 by 620, we get 5 and a remainder of 500.
Use 5 as the next digit of our solution. 
Result so far: 10287.725
Subtract 3100 from 3600 to get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Step 11:
If we divide 5000 by 620, we get 8 and a remainder of 40.
The number 8 becomes the next digit in our result. 
Result so far: 10287.7258
Subtract 4960 from 5000 to 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 12:
If we divide 400 by 620, we get 0 and a remainder of 400.
The number 0 becomes the next digit in our result. 
Result so far: 10287.7258
Deduct 0 from 400 and we're left with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Let's proceed to step 13:
620 can be fit into 4000 6 times, resulting in a remainder of 280.
Put 6 as the next digit of the answer. 
Result so far: 10287.725806
If we take 3720 away from 4000, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 14:
620 goes into 2800 4 times with a remainder of 320.
The number 4 becomes the next digit in our result. 
Result so far: 10287.7258064
If we take 2480 away from 2800, we end up with 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 15:
When dividing 3200 by 620, we get 5 with a remainder of 100.
Record the quotient 5 as the next digit in the result. 
Result so far: 10287.72580645
The remainder is 100 after subtracting 3100 from 3200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final result is 10287.72580645 with a remainder of 1e-07.