300639 ÷ 42 
We want to figure out the number of times 300639 can be divided by 42.

Advancing to step 1:
The number 42 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 42

Step 2:
30 divided by 42 is 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 30, we end up with 30.
Grab the next digit (0) from the dividend, add it to 30, then carry on: 300 / 42

Moving on to step 3:
When dividing 300 by 42, we get 7 with a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 294 from 300, we get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 42

Step 4:
The number 42 fits into 66 1 times, leaving a remainder of 24.
The next digit of our result is 1. 
Result so far: 71.0
The remainder is 24 after subtracting 42 from 66.
Grab the next digit (3) from the dividend, add it to 24, then carry on: 243 / 42

Going ahead to step 5:
42 goes into 243 5 times with a remainder of 33.
The number 5 becomes the next digit in our result. 
Result so far: 715.0
Deduct 210 from 243 and we're left with 33.
Include the next digit (9) from the dividend after 33, then repeat: 339 / 42

Let's proceed to step 6:
The number 42 fits into 339 8 times, leaving a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 7158.0
Subtracting 336 from 339 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.

On to step 7:
If we divide 30 by 42, we get 0 and a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 7158.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
When dividing 300 by 42, we get 7 with a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 7158.07
If we subtract 294 from 300, we 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.

Moving on to step 9:
The number 42 fits into 60 1 times, leaving a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 7158.071
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 10:
180 divided by 42 is 4 with a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 7158.0714
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 11:
If we divide 120 by 42, we get 2 and a remainder of 36.
The next digit of our result is 2. 
Result so far: 7158.07142
The remainder is 36 after subtracting 84 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 12:
42 goes into 360 8 times with a remainder of 24.
Write down 8 as next digit of the result. 
Result so far: 7158.071428
Subtract 336 from 360 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 13:
240 divided by 42 is 5 with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 7158.0714285
Subtract 210 from 240 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 14:
42 can be fit into 300 7 times, resulting in a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 7158.07142857
If we take 294 away from 300, 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.

The final outcome is 7158.07142857, with a leftover of 6e-09.