We're dividing 42961897 by 645 
We want to figure out the number of times 42961897 can be divided by 645.

Step 1:
645 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 645

Let's proceed to step 2:
If we divide 42 by 645, we get 0 and a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Fetch the next digit (9) from the dividend, attach it to 42 and continue: 429 / 645

Step 3:
645 can be fit into 429 0 times, resulting in a remainder of 429.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 429 to get 429.
Append the next digit (6) from the dividend to 429 and continue with: 4296 / 645

Step 4:
The number 645 fits into 4296 6 times, leaving a remainder of 426.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Deduct 3870 from 4296 and we're left with 426.
Include the next digit (1) from the dividend after 426, then repeat: 4261 / 645

Step 5:
645 goes into 4261 6 times with a remainder of 391.
Put 6 as the next digit of the answer. 
Result so far: 66.0
The remainder is 391 after subtracting 3870 from 4261.
Grab the next digit (8) from the dividend, add it to 391, then carry on: 3918 / 645

Advancing to step 6:
645 can be fit into 3918 6 times, resulting in a remainder of 48.
The number 6 becomes the next digit in our result. 
Result so far: 666.0
Subtracting 3870 from 3918 leaves us with 48.
Grab the next digit (9) from the dividend, add it to 48, then carry on: 489 / 645

Going ahead to step 7:
489 divided by 645 is 0 with a remainder of 489.
Put 0 as the next digit of the answer. 
Result so far: 6660.0
Subtracting 0 from 489 leaves us with 489.
Fetch the next digit (7) from the dividend, attach it to 489 and continue: 4897 / 645

Step 8:
If we divide 4897 by 645, we get 7 and a remainder of 382.
The next digit of our result is 7. 
Result so far: 66607.0
Subtracting 4515 from 4897 leaves us with 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

Let's proceed to step 9:
645 goes into 3820 5 times with a remainder of 595.
The number 5 becomes the next digit in our result. 
Result so far: 66607.5
Subtract 3225 from 3820 to get 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Let's proceed to step 10:
When dividing 5950 by 645, we get 9 with a remainder of 145.
Record the quotient 9 as the next digit in the result. 
Result so far: 66607.59
If we take 5805 away from 5950, we end up with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Step 11:
1450 divided by 645 is 2 with a remainder of 160.
Use 2 as the next digit of our solution. 
Result so far: 66607.592
Subtracting 1290 from 1450 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 12:
645 goes into 1600 2 times with a remainder of 310.
Put 2 as the next digit of the answer. 
Result so far: 66607.5922
Subtract 1290 from 1600 to get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

After the division, we end up with 66607.5922 and a remainder of 0.0031.