We're dividing 51603354 by 8 
We're looking to find how many times 8 goes into 51603354.

Advancing to step 1:
8 goes into 5 0 times with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 8

Moving on to step 2:
51 divided by 8 is 6 with a remainder of 3.
Write down 6 as next digit of the result. 
Result so far: 6.0
Subtract 48 from 51 to get 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 8

Advancing to step 3:
8 goes into 36 4 times with a remainder of 4.
Record the quotient 4 as the next digit in the result. 
Result so far: 64.0
If we subtract 32 from 36, we get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 8

Going ahead to step 4:
The number 8 fits into 40 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 645.0
If we subtract 40 from 40, we get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 8

On to step 5:
8 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 6450.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 8

Step 6:
8 can be fit into 33 4 times, resulting in a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 64504.0
If we take 32 away from 33, we end up with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 8

Step 7:
15 divided by 8 is 1 with a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 645041.0
If we take 8 away from 15, we end up with 7.
Take the next digit (4) from the dividend and append it to 7, then repeat: 74 / 8

Going ahead to step 8:
If we divide 74 by 8, we get 9 and a remainder of 2.
The next digit of our result is 9. 
Result so far: 6450419.0
If we subtract 72 from 74, we 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:
When dividing 20 by 8, we get 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 6450419.2
Subtract 16 from 20 to 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.

Step 10:
40 divided by 8 is 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 6450419.25
If we subtract 40 from 40, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 11:
The number 8 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 6450419.25
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 12:
When dividing 0 by 8, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6450419.25
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 6450419.25, and the remainder is 0.0.