53939459 ÷ 3 
We want to divide 53939459 by 3.

Advancing to step 1:
3 goes into 5 1 times with a remainder of 2.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 3 from 5 leaves us with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 3

On to step 2:
3 goes into 23 7 times with a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we take 21 away from 23, we end up with 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 3

Let's proceed to step 3:
3 goes into 29 9 times with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 179.0
Subtracting 27 from 29 leaves us with 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 3

Advancing to step 4:
3 goes into 23 7 times with a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 1797.0
If we take 21 away from 23, we end up with 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 3

Advancing to step 5:
If we divide 29 by 3, we get 9 and a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 17979.0
Subtracting 27 from 29 leaves us with 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 3

Going ahead to step 6:
3 can be fit into 24 8 times, resulting in a remainder of 0.
The next digit of our result is 8. 
Result so far: 179798.0
The remainder is 0 after subtracting 24 from 24.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 3

Step 7:
When dividing 5 by 3, we get 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1797981.0
Deduct 3 from 5 and we're left with 2.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 3

Going ahead to step 8:
29 divided by 3 is 9 with a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 17979819.0
Deduct 27 from 29 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 9:
When dividing 20 by 3, we get 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 17979819.6
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.

Advancing to step 10:
When dividing 20 by 3, we get 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 17979819.66
Subtract 18 from 20 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 outcome is 17979819.66, with a leftover of 0.002.