We look at the division of 42668836 by 645 
We want to figure out the number of times 42668836 can be divided by 645.

Going ahead to step 1:
645 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 645

Going ahead to step 2:
If we divide 42 by 645, we get 0 and a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Take the next digit (6) from the dividend and append it to 42, then repeat: 426 / 645

Let's proceed to step 3:
If we divide 426 by 645, we get 0 and a remainder of 426.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 426 to get 426.
Bring next digit (6) of the dividend behind the 426 and repeat the process: 4266 / 645

Advancing to step 4:
645 can be fit into 4266 6 times, resulting in a remainder of 396.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 3870 away from 4266, we end up with 396.
Include the next digit (8) from the dividend after 396, then repeat: 3968 / 645

Moving on to step 5:
645 can be fit into 3968 6 times, resulting in a remainder of 98.
The next digit of our result is 6. 
Result so far: 66.0
Subtracting 3870 from 3968 leaves us with 98.
Grab the next digit (8) from the dividend, add it to 98, then carry on: 988 / 645

Going ahead to step 6:
645 goes into 988 1 times with a remainder of 343.
The number 1 becomes the next digit in our result. 
Result so far: 661.0
Subtracting 645 from 988 leaves us with 343.
Grab the next digit (3) from the dividend, add it to 343, then carry on: 3433 / 645

Going ahead to step 7:
If we divide 3433 by 645, we get 5 and a remainder of 208.
Put 5 as the next digit of the answer. 
Result so far: 6615.0
Deduct 3225 from 3433 and we're left with 208.
Append the next digit (6) from the dividend to 208 and continue with: 2086 / 645

Advancing to step 8:
645 goes into 2086 3 times with a remainder of 151.
The number 3 becomes the next digit in our result. 
Result so far: 66153.0
The remainder is 151 after subtracting 1935 from 2086.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Moving on to step 9:
The number 645 fits into 1510 2 times, leaving a remainder of 220.
Write down 2 as next digit of the result. 
Result so far: 66153.2
Subtracting 1290 from 1510 leaves us with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 10:
If we divide 2200 by 645, we get 3 and a remainder of 265.
Record the quotient 3 as the next digit in the result. 
Result so far: 66153.23
Deduct 1935 from 2200 and we're left with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Step 11:
2650 divided by 645 is 4 with a remainder of 70.
Record the quotient 4 as the next digit in the result. 
Result so far: 66153.234
If we take 2580 away from 2650, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 12:
The number 645 fits into 700 1 times, leaving a remainder of 55.
The next digit of our result is 1. 
Result so far: 66153.2341
Subtracting 645 from 700 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 13:
645 goes into 550 0 times with a remainder of 550.
Put 0 as the next digit of the answer. 
Result so far: 66153.2341
The remainder is 550 after subtracting 0 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Going ahead to step 14:
If we divide 5500 by 645, we get 8 and a remainder of 340.
Write down 8 as next digit of the result. 
Result so far: 66153.234108
Deduct 5160 from 5500 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Moving on to step 15:
645 goes into 3400 5 times with a remainder of 175.
The next digit of our result is 5. 
Result so far: 66153.2341085
Subtracting 3225 from 3400 leaves us with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Advancing to step 16:
When dividing 1750 by 645, we get 2 with a remainder of 460.
Write down 2 as next digit of the result. 
Result so far: 66153.23410852
Subtract 1290 from 1750 to get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

After the division, we end up with 66153.23410852 and a remainder of 4.6e-07.