We look at the division of 51671042 by 3 
We want to figure out the number of times 51671042 can be divided by 3.

On to step 1:
5 divided by 3 is 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 3 from 5 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 3

On to step 2:
The number 3 fits into 21 7 times, leaving a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 17.0
Deduct 21 from 21 and we're left with 0.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 3

Moving on to step 3:
The number 3 fits into 6 2 times, leaving a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 172.0
Deduct 6 from 6 and we're left with 0.
Grab the next digit (7) from the dividend, add it to 0, then carry on: 7 / 3

Step 4:
3 can be fit into 7 2 times, resulting in a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 1722.0
Deduct 6 from 7 and we're left with 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 3

Moving on to step 5:
11 divided by 3 is 3 with a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 17223.0
If we subtract 9 from 11, we get 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 3

Advancing to step 6:
3 can be fit into 20 6 times, resulting in a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 172236.0
If we take 18 away from 20, we end up with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 3

Moving on to step 7:
3 can be fit into 24 8 times, resulting in a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 1722368.0
Deduct 24 from 24 and we're left with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 3

Let's proceed to step 8:
If we divide 2 by 3, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 17223680.0
Subtract 0 from 2 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.

On to step 9:
If we divide 20 by 3, we get 6 and a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 17223680.6
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
20 divided by 3 is 6 with a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 17223680.66
If we take 18 away from 20, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 17223680.66 and a remainder of 0.002.