Let's divide 21505058 by 285
We want to figure out the number of times 21505058 can be divided by 285.

On to step 1:
When dividing 2 by 285, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 285

On to step 2:
285 goes into 21 0 times with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Bring next digit (5) of the dividend behind the 21 and repeat the process: 215 / 285

Let's proceed to step 3:
The number 285 fits into 215 0 times, leaving a remainder of 215.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 215, we end up with 215.
Include the next digit (0) from the dividend after 215, then repeat: 2150 / 285

Going ahead to step 4:
When dividing 2150 by 285, we get 7 with a remainder of 155.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 1995 from 2150 to get 155.
Include the next digit (5) from the dividend after 155, then repeat: 1555 / 285

Advancing to step 5:
285 goes into 1555 5 times with a remainder of 130.
Use 5 as the next digit of our solution. 
Result so far: 75.0
Subtract 1425 from 1555 to get 130.
Fetch the next digit (0) from the dividend, attach it to 130 and continue: 1300 / 285

Let's proceed to step 6:
The number 285 fits into 1300 4 times, leaving a remainder of 160.
Use 4 as the next digit of our solution. 
Result so far: 754.0
Subtract 1140 from 1300 to get 160.
Include the next digit (5) from the dividend after 160, then repeat: 1605 / 285

Advancing to step 7:
1605 divided by 285 is 5 with a remainder of 180.
The next digit of our result is 5. 
Result so far: 7545.0
Subtracting 1425 from 1605 leaves us with 180.
Fetch the next digit (8) from the dividend, attach it to 180 and continue: 1808 / 285

Moving on to step 8:
285 can be fit into 1808 6 times, resulting in a remainder of 98.
The next digit of our result is 6. 
Result so far: 75456.0
Subtract 1710 from 1808 to get 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

Let's proceed to step 9:
285 can be fit into 980 3 times, resulting in a remainder of 125.
The number 3 becomes the next digit in our result. 
Result so far: 75456.3
The remainder is 125 after subtracting 855 from 980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 10:
The number 285 fits into 1250 4 times, leaving a remainder of 110.
Record the quotient 4 as the next digit in the result. 
Result so far: 75456.34
The remainder is 110 after subtracting 1140 from 1250.
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 11:
285 goes into 1100 3 times with a remainder of 245.
Write down 3 as next digit of the result. 
Result so far: 75456.343
Subtracting 855 from 1100 leaves us with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Let's proceed to step 12:
When dividing 2450 by 285, we get 8 with a remainder of 170.
The next digit of our result is 8. 
Result so far: 75456.3438
If we take 2280 away from 2450, we end up with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Step 13:
When dividing 1700 by 285, we get 5 with a remainder of 275.
Use 5 as the next digit of our solution. 
Result so far: 75456.34385
The remainder is 275 after subtracting 1425 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Step 14:
285 goes into 2750 9 times with a remainder of 185.
Record the quotient 9 as the next digit in the result. 
Result so far: 75456.343859
If we take 2565 away from 2750, we end up with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Going ahead to step 15:
When dividing 1850 by 285, we get 6 with a remainder of 140.
Put 6 as the next digit of the answer. 
Result so far: 75456.3438596
Subtract 1710 from 1850 to get 140.
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 16:
1400 divided by 285 is 4 with a remainder of 260.
The number 4 becomes the next digit in our result. 
Result so far: 75456.34385964
Subtracting 1140 from 1400 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

After the division, we end up with 75456.34385964 and a remainder of 2.6e-07.