399510 ÷ 74 
We want to figure out the number of times 399510 can be divided by 74.

Let's proceed to step 1:
74 can be fit into 3 0 times, resulting in a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 74

Step 2:
If we divide 39 by 74, we get 0 and a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Take the next digit (9) from the dividend and append it to 39, then repeat: 399 / 74

Step 3:
When dividing 399 by 74, we get 5 with a remainder of 29.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtracting 370 from 399 leaves us with 29.
Bring next digit (5) of the dividend behind the 29 and repeat the process: 295 / 74

Step 4:
When dividing 295 by 74, we get 3 with a remainder of 73.
The next digit of our result is 3. 
Result so far: 53.0
If we take 222 away from 295, we end up with 73.
Include the next digit (1) from the dividend after 73, then repeat: 731 / 74

On to step 5:
731 divided by 74 is 9 with a remainder of 65.
Put 9 as the next digit of the answer. 
Result so far: 539.0
Deduct 666 from 731 and we're left with 65.
Fetch the next digit (0) from the dividend, attach it to 65 and continue: 650 / 74

Advancing to step 6:
74 goes into 650 8 times with a remainder of 58.
Record the quotient 8 as the next digit in the result. 
Result so far: 5398.0
If we subtract 592 from 650, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 7:
The number 74 fits into 580 7 times, leaving a remainder of 62.
The number 7 becomes the next digit in our result. 
Result so far: 5398.7
Subtracting 518 from 580 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 8:
74 goes into 620 8 times with a remainder of 28.
Put 8 as the next digit of the answer. 
Result so far: 5398.78
Subtracting 592 from 620 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 9:
The number 74 fits into 280 3 times, leaving a remainder of 58.
Record the quotient 3 as the next digit in the result. 
Result so far: 5398.783
Subtract 222 from 280 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 10:
If we divide 580 by 74, we get 7 and a remainder of 62.
Use 7 as the next digit of our solution. 
Result so far: 5398.7837
Subtract 518 from 580 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 11:
74 can be fit into 620 8 times, resulting in a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 5398.78378
If we take 592 away from 620, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 12:
74 goes into 280 3 times with a remainder of 58.
Record the quotient 3 as the next digit in the result. 
Result so far: 5398.783783
Subtract 222 from 280 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 13:
If we divide 580 by 74, we get 7 and a remainder of 62.
Record the quotient 7 as the next digit in the result. 
Result so far: 5398.7837837
If we subtract 518 from 580, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 14:
When dividing 620 by 74, we get 8 with a remainder of 28.
Use 8 as the next digit of our solution. 
Result so far: 5398.78378378
If we subtract 592 from 620, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The final result is 5398.78378378 with a remainder of 2.8e-08.