56603421 ÷ 438 
Let's see how many times 438 fits into 56603421.

Moving on to step 1:
The number 438 fits into 5 0 times, leaving a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 438

Moving on to step 2:
56 divided by 438 is 0 with a remainder of 56.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 56 to get 56.
Fetch the next digit (6) from the dividend, attach it to 56 and continue: 566 / 438

Going ahead to step 3:
If we divide 566 by 438, we get 1 and a remainder of 128.
The next digit of our result is 1. 
Result so far: 1.0
If we take 438 away from 566, we end up with 128.
Append the next digit (0) from the dividend to 128 and continue with: 1280 / 438

Let's proceed to step 4:
When dividing 1280 by 438, we get 2 with a remainder of 404.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Deduct 876 from 1280 and we're left with 404.
Grab the next digit (3) from the dividend, add it to 404, then carry on: 4043 / 438

Going ahead to step 5:
If we divide 4043 by 438, we get 9 and a remainder of 101.
Put 9 as the next digit of the answer. 
Result so far: 129.0
If we subtract 3942 from 4043, we get 101.
Take the next digit (4) from the dividend and append it to 101, then repeat: 1014 / 438

Going ahead to step 6:
When dividing 1014 by 438, we get 2 with a remainder of 138.
Write down 2 as next digit of the result. 
Result so far: 1292.0
Subtract 876 from 1014 to get 138.
Bring next digit (2) of the dividend behind the 138 and repeat the process: 1382 / 438

Going ahead to step 7:
1382 divided by 438 is 3 with a remainder of 68.
Record the quotient 3 as the next digit in the result. 
Result so far: 12923.0
Subtracting 1314 from 1382 leaves us with 68.
Bring next digit (1) of the dividend behind the 68 and repeat the process: 681 / 438

On to step 8:
If we divide 681 by 438, we get 1 and a remainder of 243.
The next digit of our result is 1. 
Result so far: 129231.0
Subtracting 438 from 681 leaves us with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Let's proceed to step 9:
438 can be fit into 2430 5 times, resulting in a remainder of 240.
Record the quotient 5 as the next digit in the result. 
Result so far: 129231.5
If we take 2190 away from 2430, we end up with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 10:
When dividing 2400 by 438, we get 5 with a remainder of 210.
Put 5 as the next digit of the answer. 
Result so far: 129231.55
Deduct 2190 from 2400 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Our division results in 129231.55 with a remaining 0.21.