8448403 divided by 451 
We're looking to find how many times 451 goes into 8448403.

Moving on to step 1:
If we divide 8 by 451, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 451

Let's proceed to step 2:
When dividing 84 by 451, we get 0 with a remainder of 84.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 84 leaves us with 84.
Grab the next digit (4) from the dividend, add it to 84, then carry on: 844 / 451

Step 3:
844 divided by 451 is 1 with a remainder of 393.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 451 from 844, we get 393.
Include the next digit (8) from the dividend after 393, then repeat: 3938 / 451

Moving on to step 4:
If we divide 3938 by 451, we get 8 and a remainder of 330.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
Subtracting 3608 from 3938 leaves us with 330.
Bring next digit (4) of the dividend behind the 330 and repeat the process: 3304 / 451

Going ahead to step 5:
451 goes into 3304 7 times with a remainder of 147.
The number 7 becomes the next digit in our result. 
Result so far: 187.0
Subtracting 3157 from 3304 leaves us with 147.
Take the next digit (0) from the dividend and append it to 147, then repeat: 1470 / 451

Step 6:
The number 451 fits into 1470 3 times, leaving a remainder of 117.
Put 3 as the next digit of the answer. 
Result so far: 1873.0
If we take 1353 away from 1470, we end up with 117.
Bring next digit (3) of the dividend behind the 117 and repeat the process: 1173 / 451

Moving on to step 7:
1173 divided by 451 is 2 with a remainder of 271.
Write down 2 as next digit of the result. 
Result so far: 18732.0
If we subtract 902 from 1173, we get 271.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

Advancing to step 8:
451 goes into 2710 6 times with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 18732.6
Deduct 2706 from 2710 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.

Going ahead to step 9:
40 divided by 451 is 0 with a remainder of 40.
The next digit of our result is 0. 
Result so far: 18732.6
If we subtract 0 from 40, we get 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 10:
When dividing 400 by 451, we get 0 with a remainder of 400.
Use 0 as the next digit of our solution. 
Result so far: 18732.6
Deduct 0 from 400 and we're left 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.

The final outcome is 18732.6, with a leftover of 0.04.