321573 ÷ 79 
We want to figure out the number of times 321573 can be divided by 79.

Moving on to step 1:
If we divide 3 by 79, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (2) from the dividend, add it to 3, then carry on: 32 / 79

Let's proceed to step 2:
If we divide 32 by 79, we get 0 and a remainder of 32.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 32 and we're left with 32.
Bring next digit (1) of the dividend behind the 32 and repeat the process: 321 / 79

Advancing to step 3:
If we divide 321 by 79, we get 4 and a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 316 from 321, we get 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 79

Moving on to step 4:
When dividing 55 by 79, we get 0 with a remainder of 55.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
The remainder is 55 after subtracting 0 from 55.
Append the next digit (7) from the dividend to 55 and continue with: 557 / 79

On to step 5:
The number 79 fits into 557 7 times, leaving a remainder of 4.
The next digit of our result is 7. 
Result so far: 407.0
The remainder is 4 after subtracting 553 from 557.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 79

On to step 6:
79 goes into 43 0 times with a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 4070.0
The remainder is 43 after subtracting 0 from 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 7:
79 can be fit into 430 5 times, resulting in a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 4070.5
Deduct 395 from 430 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 8:
79 can be fit into 350 4 times, resulting in a remainder of 34.
Put 4 as the next digit of the answer. 
Result so far: 4070.54
Deduct 316 from 350 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 9:
79 can be fit into 340 4 times, resulting in a remainder of 24.
Put 4 as the next digit of the answer. 
Result so far: 4070.544
Deduct 316 from 340 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final outcome is 4070.544, with a leftover of 0.0024.