We look at the division of 851407 by 7 
We want to divide 851407 by 7.

Let's proceed to step 1:
The number 7 fits into 8 1 times, leaving a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 7 from 8 to get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 7

Advancing to step 2:
15 divided by 7 is 2 with a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 14 from 15 and we're left with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 7

Step 3:
The number 7 fits into 11 1 times, leaving a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 121.0
Subtracting 7 from 11 leaves us with 4.
Take the next digit (4) from the dividend and append it to 4, then repeat: 44 / 7

Going ahead to step 4:
44 divided by 7 is 6 with a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 1216.0
If we take 42 away from 44, we end up with 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 7

On to step 5:
If we divide 20 by 7, we get 2 and a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 12162.0
If we take 14 away from 20, we end up with 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 7

Going ahead to step 6:
7 goes into 67 9 times with a remainder of 4.
The next digit of our result is 9. 
Result so far: 121629.0
Subtract 63 from 67 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
If we divide 40 by 7, we get 5 and a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 121629.5
If we subtract 35 from 40, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 8:
7 can be fit into 50 7 times, resulting in a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 121629.57
Subtracting 49 from 50 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
If we divide 10 by 7, we get 1 and a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 121629.571
If we take 7 away from 10, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
7 can be fit into 30 4 times, resulting in a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 121629.5714
The remainder is 2 after subtracting 28 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
If we divide 20 by 7, we get 2 and a remainder of 6.
The next digit of our result is 2. 
Result so far: 121629.57142
Subtract 14 from 20 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 12:
7 can be fit into 60 8 times, resulting in a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 121629.571428
Deduct 56 from 60 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 13:
If we divide 40 by 7, we get 5 and a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 121629.5714285
The remainder is 5 after subtracting 35 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 14:
If we divide 50 by 7, we get 7 and a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 121629.57142857
The remainder is 1 after subtracting 49 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final result is 121629.57142857 with a remainder of 1e-09.