We're dividing 451389 by 7 
We want to figure out the number of times 451389 can be divided by 7.

Advancing to step 1:
4 divided by 7 is 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 7

Moving on to step 2:
7 goes into 45 6 times with a remainder of 3.
The next digit of our result is 6. 
Result so far: 6.0
If we subtract 42 from 45, we get 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 7

Going ahead to step 3:
7 can be fit into 31 4 times, resulting in a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 64.0
Subtracting 28 from 31 leaves us with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 7

Going ahead to step 4:
7 can be fit into 33 4 times, resulting in a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 644.0
Subtract 28 from 33 to get 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 7

Advancing to step 5:
If we divide 58 by 7, we get 8 and a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 6448.0
Subtracting 56 from 58 leaves us with 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 7

On to step 6:
29 divided by 7 is 4 with a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 64484.0
If we subtract 28 from 29, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
7 can be fit into 10 1 times, resulting in a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 64484.1
The remainder is 3 after subtracting 7 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 8:
7 can be fit into 30 4 times, resulting in a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 64484.14
If we subtract 28 from 30, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 9:
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: 64484.142
If we take 14 away from 20, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 10:
If we divide 60 by 7, we get 8 and a remainder of 4.
The next digit of our result is 8. 
Result so far: 64484.1428
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.

On to step 11:
7 goes into 40 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 64484.14285
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.

Advancing to step 12:
7 goes into 50 7 times with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 64484.142857
Deduct 49 from 50 and we're left 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.

Going ahead to step 13:
The number 7 fits into 10 1 times, leaving a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 64484.1428571
Subtracting 7 from 10 leaves us 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 14:
7 can be fit into 30 4 times, resulting in a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 64484.14285714
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.

After the division, we end up with 64484.14285714 and a remainder of 2e-09.