42170558 ÷ 510 
We want to divide 42170558 by 510.

Step 1:
The number 510 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 510

On to step 2:
510 goes into 42 0 times with a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Fetch the next digit (1) from the dividend, attach it to 42 and continue: 421 / 510

Advancing to step 3:
If we divide 421 by 510, we get 0 and a remainder of 421.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 421, we get 421.
Include the next digit (7) from the dividend after 421, then repeat: 4217 / 510

Let's proceed to step 4:
4217 divided by 510 is 8 with a remainder of 137.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Deduct 4080 from 4217 and we're left with 137.
Take the next digit (0) from the dividend and append it to 137, then repeat: 1370 / 510

Let's proceed to step 5:
The number 510 fits into 1370 2 times, leaving a remainder of 350.
Record the quotient 2 as the next digit in the result. 
Result so far: 82.0
Deduct 1020 from 1370 and we're left with 350.
Include the next digit (5) from the dividend after 350, then repeat: 3505 / 510

Advancing to step 6:
If we divide 3505 by 510, we get 6 and a remainder of 445.
The number 6 becomes the next digit in our result. 
Result so far: 826.0
If we take 3060 away from 3505, we end up with 445.
Bring next digit (5) of the dividend behind the 445 and repeat the process: 4455 / 510

Step 7:
510 can be fit into 4455 8 times, resulting in a remainder of 375.
Record the quotient 8 as the next digit in the result. 
Result so far: 8268.0
Subtract 4080 from 4455 to get 375.
Fetch the next digit (8) from the dividend, attach it to 375 and continue: 3758 / 510

Going ahead to step 8:
510 goes into 3758 7 times with a remainder of 188.
Use 7 as the next digit of our solution. 
Result so far: 82687.0
Subtract 3570 from 3758 to get 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 9:
If we divide 1880 by 510, we get 3 and a remainder of 350.
The next digit of our result is 3. 
Result so far: 82687.3
Subtract 1530 from 1880 to get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

On to step 10:
When dividing 3500 by 510, we get 6 with a remainder of 440.
Put 6 as the next digit of the answer. 
Result so far: 82687.36
Deduct 3060 from 3500 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Advancing to step 11:
The number 510 fits into 4400 8 times, leaving a remainder of 320.
The number 8 becomes the next digit in our result. 
Result so far: 82687.368
Subtract 4080 from 4400 to get 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 12:
When dividing 3200 by 510, we get 6 with a remainder of 140.
The next digit of our result is 6. 
Result so far: 82687.3686
Deduct 3060 from 3200 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 13:
If we divide 1400 by 510, we get 2 and a remainder of 380.
Record the quotient 2 as the next digit in the result. 
Result so far: 82687.36862
Subtracting 1020 from 1400 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Step 14:
When dividing 3800 by 510, we get 7 with a remainder of 230.
Put 7 as the next digit of the answer. 
Result so far: 82687.368627
If we take 3570 away from 3800, we end up with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Moving on to step 15:
The number 510 fits into 2300 4 times, leaving a remainder of 260.
Record the quotient 4 as the next digit in the result. 
Result so far: 82687.3686274
Subtracting 2040 from 2300 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 16:
510 can be fit into 2600 5 times, resulting in a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 82687.36862745
If we subtract 2550 from 2600, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final result is 82687.36862745 with a remainder of 5e-08.