42515599 ÷ 343 
We want to figure out the number of times 42515599 can be divided by 343.

Moving on to step 1:
When dividing 4 by 343, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 343

On to step 2:
The number 343 fits into 42 0 times, leaving a remainder of 42.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Include the next digit (5) from the dividend after 42, then repeat: 425 / 343

Let's proceed to step 3:
343 goes into 425 1 times with a remainder of 82.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 343 away from 425, we end up with 82.
Include the next digit (1) from the dividend after 82, then repeat: 821 / 343

Moving on to step 4:
When dividing 821 by 343, we get 2 with a remainder of 135.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 686 from 821 leaves us with 135.
Bring next digit (5) of the dividend behind the 135 and repeat the process: 1355 / 343

Step 5:
1355 divided by 343 is 3 with a remainder of 326.
The next digit of our result is 3. 
Result so far: 123.0
If we take 1029 away from 1355, we end up with 326.
Take the next digit (5) from the dividend and append it to 326, then repeat: 3265 / 343

Let's proceed to step 6:
343 can be fit into 3265 9 times, resulting in a remainder of 178.
Use 9 as the next digit of our solution. 
Result so far: 1239.0
If we subtract 3087 from 3265, we get 178.
Take the next digit (9) from the dividend and append it to 178, then repeat: 1789 / 343

Advancing to step 7:
1789 divided by 343 is 5 with a remainder of 74.
The next digit of our result is 5. 
Result so far: 12395.0
If we subtract 1715 from 1789, we get 74.
Fetch the next digit (9) from the dividend, attach it to 74 and continue: 749 / 343

On to step 8:
If we divide 749 by 343, we get 2 and a remainder of 63.
The next digit of our result is 2. 
Result so far: 123952.0
Subtract 686 from 749 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Going ahead to step 9:
The number 343 fits into 630 1 times, leaving a remainder of 287.
Record the quotient 1 as the next digit in the result. 
Result so far: 123952.1
Deduct 343 from 630 and we're left with 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

On to step 10:
2870 divided by 343 is 8 with a remainder of 126.
Use 8 as the next digit of our solution. 
Result so far: 123952.18
If we take 2744 away from 2870, we end up with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Moving on to step 11:
343 goes into 1260 3 times with a remainder of 231.
The next digit of our result is 3. 
Result so far: 123952.183
Deduct 1029 from 1260 and we're left with 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Step 12:
343 can be fit into 2310 6 times, resulting in a remainder of 252.
Use 6 as the next digit of our solution. 
Result so far: 123952.1836
Deduct 2058 from 2310 and we're left with 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Advancing to step 13:
343 can be fit into 2520 7 times, resulting in a remainder of 119.
The next digit of our result is 7. 
Result so far: 123952.18367
Deduct 2401 from 2520 and we're left with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Let's proceed to step 14:
If we divide 1190 by 343, we get 3 and a remainder of 161.
Record the quotient 3 as the next digit in the result. 
Result so far: 123952.183673
Subtract 1029 from 1190 to get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Let's proceed to step 15:
The number 343 fits into 1610 4 times, leaving a remainder of 238.
Put 4 as the next digit of the answer. 
Result so far: 123952.1836734
The remainder is 238 after subtracting 1372 from 1610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

On to step 16:
If we divide 2380 by 343, we get 6 and a remainder of 322.
Record the quotient 6 as the next digit in the result. 
Result so far: 123952.18367346
The remainder is 322 after subtracting 2058 from 2380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

The quotient of the division is 123952.18367346, and the remainder is 3.22e-07.