51215153 ÷ 742 
We want to divide 51215153 by 742.

Step 1:
The number 742 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 742

Advancing to step 2:
When dividing 51 by 742, we get 0 with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Include the next digit (2) from the dividend after 51, then repeat: 512 / 742

Step 3:
742 goes into 512 0 times with a remainder of 512.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 512, we end up with 512.
Fetch the next digit (1) from the dividend, attach it to 512 and continue: 5121 / 742

On to step 4:
If we divide 5121 by 742, we get 6 and a remainder of 669.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 4452 away from 5121, we end up with 669.
Fetch the next digit (5) from the dividend, attach it to 669 and continue: 6695 / 742

On to step 5:
If we divide 6695 by 742, we get 9 and a remainder of 17.
Write down 9 as next digit of the result. 
Result so far: 69.0
If we take 6678 away from 6695, we end up with 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 742

Advancing to step 6:
171 divided by 742 is 0 with a remainder of 171.
Record the quotient 0 as the next digit in the result. 
Result so far: 690.0
Subtracting 0 from 171 leaves us with 171.
Fetch the next digit (5) from the dividend, attach it to 171 and continue: 1715 / 742

Advancing to step 7:
742 goes into 1715 2 times with a remainder of 231.
The next digit of our result is 2. 
Result so far: 6902.0
If we subtract 1484 from 1715, we get 231.
Take the next digit (3) from the dividend and append it to 231, then repeat: 2313 / 742

Advancing to step 8:
The number 742 fits into 2313 3 times, leaving a remainder of 87.
Put 3 as the next digit of the answer. 
Result so far: 69023.0
Deduct 2226 from 2313 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Let's proceed to step 9:
742 can be fit into 870 1 times, resulting in a remainder of 128.
Put 1 as the next digit of the answer. 
Result so far: 69023.1
The remainder is 128 after subtracting 742 from 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 10:
1280 divided by 742 is 1 with a remainder of 538.
Write down 1 as next digit of the result. 
Result so far: 69023.11
Subtract 742 from 1280 to get 538.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5380, and continue the process.

After the division, we end up with 69023.11 and a remainder of 0.538.