79345553 divided by 643 
We're looking to find how many times 643 goes into 79345553.

Step 1:
7 divided by 643 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 643

Let's proceed to step 2:
643 can be fit into 79 0 times, resulting in a remainder of 79.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 79 and we're left with 79.
Append the next digit (3) from the dividend to 79 and continue with: 793 / 643

Step 3:
The number 643 fits into 793 1 times, leaving a remainder of 150.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 643 from 793 to get 150.
Bring next digit (4) of the dividend behind the 150 and repeat the process: 1504 / 643

On to step 4:
When dividing 1504 by 643, we get 2 with a remainder of 218.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we take 1286 away from 1504, we end up with 218.
Append the next digit (5) from the dividend to 218 and continue with: 2185 / 643

Advancing to step 5:
If we divide 2185 by 643, we get 3 and a remainder of 256.
Write down 3 as next digit of the result. 
Result so far: 123.0
Subtracting 1929 from 2185 leaves us with 256.
Fetch the next digit (5) from the dividend, attach it to 256 and continue: 2565 / 643

Step 6:
2565 divided by 643 is 3 with a remainder of 636.
Record the quotient 3 as the next digit in the result. 
Result so far: 1233.0
If we subtract 1929 from 2565, we get 636.
Bring next digit (5) of the dividend behind the 636 and repeat the process: 6365 / 643

Going ahead to step 7:
When dividing 6365 by 643, we get 9 with a remainder of 578.
The number 9 becomes the next digit in our result. 
Result so far: 12339.0
Subtracting 5787 from 6365 leaves us with 578.
Bring next digit (3) of the dividend behind the 578 and repeat the process: 5783 / 643

Going ahead to step 8:
643 can be fit into 5783 8 times, resulting in a remainder of 639.
The number 8 becomes the next digit in our result. 
Result so far: 123398.0
Subtracting 5144 from 5783 leaves us with 639.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6390, and continue the process.

Going ahead to step 9:
643 can be fit into 6390 9 times, resulting in a remainder of 603.
Record the quotient 9 as the next digit in the result. 
Result so far: 123398.9
Deduct 5787 from 6390 and we're left with 603.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6030, and continue the process.

Going ahead to step 10:
643 can be fit into 6030 9 times, resulting in a remainder of 243.
The next digit of our result is 9. 
Result so far: 123398.99
If we subtract 5787 from 6030, we get 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Our division results in 123398.99 with a remaining 0.243.