42456671 ÷ 800 
We're looking to find how many times 800 goes into 42456671.

Going ahead to step 1:
The number 800 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 800

On to step 2:
The number 800 fits into 42 0 times, leaving a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 42, we get 42.
Grab the next digit (4) from the dividend, add it to 42, then carry on: 424 / 800

Advancing to step 3:
When dividing 424 by 800, we get 0 with a remainder of 424.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 424 and we're left with 424.
Include the next digit (5) from the dividend after 424, then repeat: 4245 / 800

Advancing to step 4:
4245 divided by 800 is 5 with a remainder of 245.
Write down 5 as next digit of the result. 
Result so far: 5.0
The remainder is 245 after subtracting 4000 from 4245.
Append the next digit (6) from the dividend to 245 and continue with: 2456 / 800

Moving on to step 5:
If we divide 2456 by 800, we get 3 and a remainder of 56.
Put 3 as the next digit of the answer. 
Result so far: 53.0
Deduct 2400 from 2456 and we're left with 56.
Grab the next digit (6) from the dividend, add it to 56, then carry on: 566 / 800

Let's proceed to step 6:
800 goes into 566 0 times with a remainder of 566.
Write down 0 as next digit of the result. 
Result so far: 530.0
Deduct 0 from 566 and we're left with 566.
Append the next digit (7) from the dividend to 566 and continue with: 5667 / 800

Step 7:
800 goes into 5667 7 times with a remainder of 67.
Use 7 as the next digit of our solution. 
Result so far: 5307.0
Deduct 5600 from 5667 and we're left with 67.
Take the next digit (1) from the dividend and append it to 67, then repeat: 671 / 800

Let's proceed to step 8:
The number 800 fits into 671 0 times, leaving a remainder of 671.
Put 0 as the next digit of the answer. 
Result so far: 53070.0
Subtract 0 from 671 to get 671.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6710, and continue the process.

Going ahead to step 9:
If we divide 6710 by 800, we get 8 and a remainder of 310.
Put 8 as the next digit of the answer. 
Result so far: 53070.8
If we take 6400 away from 6710, we end up with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

On to step 10:
If we divide 3100 by 800, we get 3 and a remainder of 700.
The next digit of our result is 3. 
Result so far: 53070.83
Subtract 2400 from 3100 to get 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Let's proceed to step 11:
When dividing 7000 by 800, we get 8 with a remainder of 600.
Use 8 as the next digit of our solution. 
Result so far: 53070.838
Subtract 6400 from 7000 to get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

On to step 12:
6000 divided by 800 is 7 with a remainder of 400.
Use 7 as the next digit of our solution. 
Result so far: 53070.8387
Subtracting 5600 from 6000 leaves us with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Advancing to step 13:
4000 divided by 800 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 53070.83875
Subtract 4000 from 4000 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.

Advancing to step 14:
800 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 53070.83875
Subtracting 0 from 0 leaves us 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.

On to step 15:
If we divide 0 by 800, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 53070.83875
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.

The final outcome is 53070.83875, with a leftover of 0.0.