39510885 ÷ 7 
We want to figure out the number of times 39510885 can be divided by 7.

Advancing to step 1:
If we divide 3 by 7, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 7

Advancing to step 2:
The number 7 fits into 39 5 times, leaving a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Deduct 35 from 39 and we're left with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 7

Going ahead to step 3:
The number 7 fits into 45 6 times, leaving a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 56.0
Subtracting 42 from 45 leaves us with 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 7

Moving on to step 4:
If we divide 31 by 7, we get 4 and a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 564.0
The remainder is 3 after subtracting 28 from 31.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 7

On to step 5:
7 goes into 30 4 times with a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 5644.0
Subtracting 28 from 30 leaves us with 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 7

Advancing to step 6:
7 can be fit into 28 4 times, resulting in a remainder of 0.
The next digit of our result is 4. 
Result so far: 56444.0
If we take 28 away from 28, we end up with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 7

Step 7:
8 divided by 7 is 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 564441.0
The remainder is 1 after subtracting 7 from 8.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 7

Advancing to step 8:
When dividing 15 by 7, we get 2 with a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 5644412.0
Subtract 14 from 15 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 9:
7 can be fit into 10 1 times, resulting in a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 5644412.1
Subtract 7 from 10 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
7 goes into 30 4 times with a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 5644412.14
The remainder is 2 after subtracting 28 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
When dividing 20 by 7, we get 2 with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 5644412.142
Deduct 14 from 20 and we're left 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.

Advancing to step 12:
When dividing 60 by 7, we get 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 5644412.1428
If we subtract 56 from 60, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 13:
7 goes into 40 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 5644412.14285
If we take 35 away from 40, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 14:
7 can be fit into 50 7 times, resulting in a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 5644412.142857
If we take 49 away from 50, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 15:
The number 7 fits into 10 1 times, leaving a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 5644412.1428571
Deduct 7 from 10 and we're left 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.

Let's proceed to step 16:
30 divided by 7 is 4 with a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 5644412.14285714
Subtract 28 from 30 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 5644412.14285714 with a remainder of 2e-09.