72561631 divided by 42 
We want to figure out the number of times 72561631 can be divided by 42.

On to step 1:
42 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 42

Going ahead to step 2:
42 goes into 72 1 times with a remainder of 30.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 30 after subtracting 42 from 72.
Fetch the next digit (5) from the dividend, attach it to 30 and continue: 305 / 42

Moving on to step 3:
The number 42 fits into 305 7 times, leaving a remainder of 11.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
Deduct 294 from 305 and we're left with 11.
Include the next digit (6) from the dividend after 11, then repeat: 116 / 42

On to step 4:
The number 42 fits into 116 2 times, leaving a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 172.0
If we take 84 away from 116, we end up with 32.
Grab the next digit (1) from the dividend, add it to 32, then carry on: 321 / 42

Step 5:
The number 42 fits into 321 7 times, leaving a remainder of 27.
Use 7 as the next digit of our solution. 
Result so far: 1727.0
Subtract 294 from 321 to get 27.
Bring next digit (6) of the dividend behind the 27 and repeat the process: 276 / 42

On to step 6:
If we divide 276 by 42, we get 6 and a remainder of 24.
The next digit of our result is 6. 
Result so far: 17276.0
Subtracting 252 from 276 leaves us with 24.
Grab the next digit (3) from the dividend, add it to 24, then carry on: 243 / 42

Moving on to step 7:
42 can be fit into 243 5 times, resulting in a remainder of 33.
The number 5 becomes the next digit in our result. 
Result so far: 172765.0
Deduct 210 from 243 and we're left with 33.
Fetch the next digit (1) from the dividend, attach it to 33 and continue: 331 / 42

Step 8:
If we divide 331 by 42, we get 7 and a remainder of 37.
Use 7 as the next digit of our solution. 
Result so far: 1727657.0
If we subtract 294 from 331, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 9:
370 divided by 42 is 8 with a remainder of 34.
Record the quotient 8 as the next digit in the result. 
Result so far: 1727657.8
The remainder is 34 after subtracting 336 from 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 10:
When dividing 340 by 42, we get 8 with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 1727657.88
Subtracting 336 from 340 leaves us 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.

The quotient of the division is 1727657.88, and the remainder is 0.004.