Let's divide 53139721 by 342
We're looking to find how many times 342 goes into 53139721.

Going ahead to step 1:
342 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 342

On to step 2:
When dividing 53 by 342, we get 0 with a remainder of 53.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 53 after subtracting 0 from 53.
Append the next digit (1) from the dividend to 53 and continue with: 531 / 342

Step 3:
When dividing 531 by 342, we get 1 with a remainder of 189.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 342 away from 531, we end up with 189.
Grab the next digit (3) from the dividend, add it to 189, then carry on: 1893 / 342

Step 4:
342 goes into 1893 5 times with a remainder of 183.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
The remainder is 183 after subtracting 1710 from 1893.
Fetch the next digit (9) from the dividend, attach it to 183 and continue: 1839 / 342

Moving on to step 5:
If we divide 1839 by 342, we get 5 and a remainder of 129.
The next digit of our result is 5. 
Result so far: 155.0
If we take 1710 away from 1839, we end up with 129.
Include the next digit (7) from the dividend after 129, then repeat: 1297 / 342

Advancing to step 6:
If we divide 1297 by 342, we get 3 and a remainder of 271.
The next digit of our result is 3. 
Result so far: 1553.0
Deduct 1026 from 1297 and we're left with 271.
Take the next digit (2) from the dividend and append it to 271, then repeat: 2712 / 342

Step 7:
When dividing 2712 by 342, we get 7 with a remainder of 318.
Write down 7 as next digit of the result. 
Result so far: 15537.0
Deduct 2394 from 2712 and we're left with 318.
Include the next digit (1) from the dividend after 318, then repeat: 3181 / 342

Moving on to step 8:
3181 divided by 342 is 9 with a remainder of 103.
The next digit of our result is 9. 
Result so far: 155379.0
The remainder is 103 after subtracting 3078 from 3181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Advancing to step 9:
1030 divided by 342 is 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 155379.3
Deduct 1026 from 1030 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 10:
When dividing 40 by 342, we get 0 with a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 155379.3
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 11:
342 can be fit into 400 1 times, resulting in a remainder of 58.
Record the quotient 1 as the next digit in the result. 
Result so far: 155379.301
If we take 342 away from 400, we end up with 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 12:
If we divide 580 by 342, we get 1 and a remainder of 238.
Write down 1 as next digit of the result. 
Result so far: 155379.3011
Subtracting 342 from 580 leaves us with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

After the division, we end up with 155379.3011 and a remainder of 0.00238.