78258394 ÷ 510 
We're looking to find how many times 510 goes into 78258394.

Let's proceed to step 1:
7 divided by 510 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 510

Let's proceed to step 2:
510 goes into 78 0 times with a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Append the next digit (2) from the dividend to 78 and continue with: 782 / 510

Step 3:
If we divide 782 by 510, we get 1 and a remainder of 272.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 510 from 782, we get 272.
Bring next digit (5) of the dividend behind the 272 and repeat the process: 2725 / 510

Advancing to step 4:
510 goes into 2725 5 times with a remainder of 175.
Put 5 as the next digit of the answer. 
Result so far: 15.0
The remainder is 175 after subtracting 2550 from 2725.
Append the next digit (8) from the dividend to 175 and continue with: 1758 / 510

Moving on to step 5:
The number 510 fits into 1758 3 times, leaving a remainder of 228.
Use 3 as the next digit of our solution. 
Result so far: 153.0
Subtracting 1530 from 1758 leaves us with 228.
Fetch the next digit (3) from the dividend, attach it to 228 and continue: 2283 / 510

Step 6:
If we divide 2283 by 510, we get 4 and a remainder of 243.
The next digit of our result is 4. 
Result so far: 1534.0
Subtracting 2040 from 2283 leaves us with 243.
Grab the next digit (9) from the dividend, add it to 243, then carry on: 2439 / 510

Advancing to step 7:
2439 divided by 510 is 4 with a remainder of 399.
Record the quotient 4 as the next digit in the result. 
Result so far: 15344.0
If we take 2040 away from 2439, we end up with 399.
Take the next digit (4) from the dividend and append it to 399, then repeat: 3994 / 510

Going ahead to step 8:
510 goes into 3994 7 times with a remainder of 424.
Use 7 as the next digit of our solution. 
Result so far: 153447.0
The remainder is 424 after subtracting 3570 from 3994.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Moving on to step 9:
4240 divided by 510 is 8 with a remainder of 160.
The number 8 becomes the next digit in our result. 
Result so far: 153447.8
Deduct 4080 from 4240 and we're left with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 10:
If we divide 1600 by 510, we get 3 and a remainder of 70.
The next digit of our result is 3. 
Result so far: 153447.83
Subtract 1530 from 1600 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 11:
700 divided by 510 is 1 with a remainder of 190.
The next digit of our result is 1. 
Result so far: 153447.831
Subtracting 510 from 700 leaves us with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Moving on to step 12:
When dividing 1900 by 510, we get 3 with a remainder of 370.
Write down 3 as next digit of the result. 
Result so far: 153447.8313
Deduct 1530 from 1900 and we're left with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Step 13:
When dividing 3700 by 510, we get 7 with a remainder of 130.
Use 7 as the next digit of our solution. 
Result so far: 153447.83137
Deduct 3570 from 3700 and we're left with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Let's proceed to step 14:
When dividing 1300 by 510, we get 2 with a remainder of 280.
Use 2 as the next digit of our solution. 
Result so far: 153447.831372
If we take 1020 away from 1300, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 15:
510 can be fit into 2800 5 times, resulting in a remainder of 250.
The next digit of our result is 5. 
Result so far: 153447.8313725
If we subtract 2550 from 2800, we get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

On to step 16:
510 goes into 2500 4 times with a remainder of 460.
Use 4 as the next digit of our solution. 
Result so far: 153447.83137254
Subtracting 2040 from 2500 leaves us with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

The final result is 153447.83137254 with a remainder of 4.6e-07.