We divide 54603390 by 644
Our goal is to divide 54603390 by 644.

Advancing to step 1:
If we divide 5 by 644, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 644

Let's proceed to step 2:
If we divide 54 by 644, we get 0 and a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 54, we get 54.
Append the next digit (6) from the dividend to 54 and continue with: 546 / 644

Going ahead to step 3:
The number 644 fits into 546 0 times, leaving a remainder of 546.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 546 after subtracting 0 from 546.
Include the next digit (0) from the dividend after 546, then repeat: 5460 / 644

Going ahead to step 4:
If we divide 5460 by 644, we get 8 and a remainder of 308.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 5152 from 5460 and we're left with 308.
Fetch the next digit (3) from the dividend, attach it to 308 and continue: 3083 / 644

Advancing to step 5:
If we divide 3083 by 644, we get 4 and a remainder of 507.
The number 4 becomes the next digit in our result. 
Result so far: 84.0
Subtract 2576 from 3083 to get 507.
Take the next digit (3) from the dividend and append it to 507, then repeat: 5073 / 644

Advancing to step 6:
644 goes into 5073 7 times with a remainder of 565.
The number 7 becomes the next digit in our result. 
Result so far: 847.0
Subtract 4508 from 5073 to get 565.
Include the next digit (9) from the dividend after 565, then repeat: 5659 / 644

Let's proceed to step 7:
The number 644 fits into 5659 8 times, leaving a remainder of 507.
Record the quotient 8 as the next digit in the result. 
Result so far: 8478.0
The remainder is 507 after subtracting 5152 from 5659.
Take the next digit (0) from the dividend and append it to 507, then repeat: 5070 / 644

Going ahead to step 8:
When dividing 5070 by 644, we get 7 with a remainder of 562.
Put 7 as the next digit of the answer. 
Result so far: 84787.0
The remainder is 562 after subtracting 4508 from 5070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5620, and continue the process.

Going ahead to step 9:
The number 644 fits into 5620 8 times, leaving a remainder of 468.
Use 8 as the next digit of our solution. 
Result so far: 84787.8
Subtract 5152 from 5620 to get 468.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4680, and continue the process.

Let's proceed to step 10:
644 can be fit into 4680 7 times, resulting in a remainder of 172.
Use 7 as the next digit of our solution. 
Result so far: 84787.87
If we take 4508 away from 4680, we end up with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Moving on to step 11:
644 goes into 1720 2 times with a remainder of 432.
Record the quotient 2 as the next digit in the result. 
Result so far: 84787.872
If we subtract 1288 from 1720, we get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Advancing to step 12:
When dividing 4320 by 644, we get 6 with a remainder of 456.
Record the quotient 6 as the next digit in the result. 
Result so far: 84787.8726
Subtracting 3864 from 4320 leaves us with 456.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4560, and continue the process.

Step 13:
644 goes into 4560 7 times with a remainder of 52.
Put 7 as the next digit of the answer. 
Result so far: 84787.87267
The remainder is 52 after subtracting 4508 from 4560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 14:
520 divided by 644 is 0 with a remainder of 520.
The number 0 becomes the next digit in our result. 
Result so far: 84787.87267
If we subtract 0 from 520, we get 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Step 15:
If we divide 5200 by 644, we get 8 and a remainder of 48.
Write down 8 as next digit of the result. 
Result so far: 84787.8726708
The remainder is 48 after subtracting 5152 from 5200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 16:
The number 644 fits into 480 0 times, leaving a remainder of 480.
Put 0 as the next digit of the answer. 
Result so far: 84787.8726708
Subtracting 0 from 480 leaves us with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

The final result is 84787.8726708 with a remainder of 4.8e-07.