We're dividing 90781481 by 645 
We want to figure out the number of times 90781481 can be divided by 645.

Let's proceed to step 1:
645 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 645

Going ahead to step 2:
If we divide 90 by 645, we get 0 and a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Take the next digit (7) from the dividend and append it to 90, then repeat: 907 / 645

Let's proceed to step 3:
907 divided by 645 is 1 with a remainder of 262.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 645 from 907, we get 262.
Fetch the next digit (8) from the dividend, attach it to 262 and continue: 2628 / 645

Let's proceed to step 4:
When dividing 2628 by 645, we get 4 with a remainder of 48.
Write down 4 as next digit of the result. 
Result so far: 14.0
Deduct 2580 from 2628 and we're left with 48.
Include the next digit (1) from the dividend after 48, then repeat: 481 / 645

Advancing to step 5:
If we divide 481 by 645, we get 0 and a remainder of 481.
Write down 0 as next digit of the result. 
Result so far: 140.0
If we subtract 0 from 481, we get 481.
Take the next digit (4) from the dividend and append it to 481, then repeat: 4814 / 645

Let's proceed to step 6:
645 goes into 4814 7 times with a remainder of 299.
Use 7 as the next digit of our solution. 
Result so far: 1407.0
Deduct 4515 from 4814 and we're left with 299.
Fetch the next digit (8) from the dividend, attach it to 299 and continue: 2998 / 645

Advancing to step 7:
When dividing 2998 by 645, we get 4 with a remainder of 418.
The number 4 becomes the next digit in our result. 
Result so far: 14074.0
If we subtract 2580 from 2998, we get 418.
Grab the next digit (1) from the dividend, add it to 418, then carry on: 4181 / 645

Advancing to step 8:
When dividing 4181 by 645, we get 6 with a remainder of 311.
Put 6 as the next digit of the answer. 
Result so far: 140746.0
Deduct 3870 from 4181 and we're left with 311.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

Step 9:
If we divide 3110 by 645, we get 4 and a remainder of 530.
Put 4 as the next digit of the answer. 
Result so far: 140746.4
If we take 2580 away from 3110, we end up with 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Moving on to step 10:
When dividing 5300 by 645, we get 8 with a remainder of 140.
Put 8 as the next digit of the answer. 
Result so far: 140746.48
The remainder is 140 after subtracting 5160 from 5300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 11:
645 goes into 1400 2 times with a remainder of 110.
Use 2 as the next digit of our solution. 
Result so far: 140746.482
If we subtract 1290 from 1400, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

On to step 12:
When dividing 1100 by 645, we get 1 with a remainder of 455.
Use 1 as the next digit of our solution. 
Result so far: 140746.4821
If we subtract 645 from 1100, we get 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Let's proceed to step 13:
When dividing 4550 by 645, we get 7 with a remainder of 35.
The next digit of our result is 7. 
Result so far: 140746.48217
The remainder is 35 after subtracting 4515 from 4550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 14:
350 divided by 645 is 0 with a remainder of 350.
The number 0 becomes the next digit in our result. 
Result so far: 140746.48217
Deduct 0 from 350 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 15:
3500 divided by 645 is 5 with a remainder of 275.
The next digit of our result is 5. 
Result so far: 140746.4821705
The remainder is 275 after subtracting 3225 from 3500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

On to step 16:
If we divide 2750 by 645, we get 4 and a remainder of 170.
Put 4 as the next digit of the answer. 
Result so far: 140746.48217054
Subtract 2580 from 2750 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

The quotient of the division is 140746.48217054, and the remainder is 1.7e-07.