Let's divide 42210986 by 321
Let's see how many times 321 fits into 42210986.

On to step 1:
321 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 321

Moving on to step 2:
321 goes into 42 0 times with a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Grab the next digit (2) from the dividend, add it to 42, then carry on: 422 / 321

Moving on to step 3:
The number 321 fits into 422 1 times, leaving a remainder of 101.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 321 from 422, we get 101.
Append the next digit (1) from the dividend to 101 and continue with: 1011 / 321

Let's proceed to step 4:
1011 divided by 321 is 3 with a remainder of 48.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Subtracting 963 from 1011 leaves us with 48.
Include the next digit (0) from the dividend after 48, then repeat: 480 / 321

Step 5:
321 goes into 480 1 times with a remainder of 159.
The number 1 becomes the next digit in our result. 
Result so far: 131.0
The remainder is 159 after subtracting 321 from 480.
Fetch the next digit (9) from the dividend, attach it to 159 and continue: 1599 / 321

Going ahead to step 6:
321 goes into 1599 4 times with a remainder of 315.
Record the quotient 4 as the next digit in the result. 
Result so far: 1314.0
If we subtract 1284 from 1599, we get 315.
Include the next digit (8) from the dividend after 315, then repeat: 3158 / 321

Moving on to step 7:
When dividing 3158 by 321, we get 9 with a remainder of 269.
The number 9 becomes the next digit in our result. 
Result so far: 13149.0
Subtracting 2889 from 3158 leaves us with 269.
Fetch the next digit (6) from the dividend, attach it to 269 and continue: 2696 / 321

Step 8:
2696 divided by 321 is 8 with a remainder of 128.
The number 8 becomes the next digit in our result. 
Result so far: 131498.0
If we subtract 2568 from 2696, we get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

On to step 9:
321 can be fit into 1280 3 times, resulting in a remainder of 317.
Put 3 as the next digit of the answer. 
Result so far: 131498.3
Subtracting 963 from 1280 leaves us with 317.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Going ahead to step 10:
321 can be fit into 3170 9 times, resulting in a remainder of 281.
Use 9 as the next digit of our solution. 
Result so far: 131498.39
Subtract 2889 from 3170 to get 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

Step 11:
If we divide 2810 by 321, we get 8 and a remainder of 242.
The next digit of our result is 8. 
Result so far: 131498.398
The remainder is 242 after subtracting 2568 from 2810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Moving on to step 12:
If we divide 2420 by 321, we get 7 and a remainder of 173.
The next digit of our result is 7. 
Result so far: 131498.3987
The remainder is 173 after subtracting 2247 from 2420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1730, and continue the process.

Step 13:
321 can be fit into 1730 5 times, resulting in a remainder of 125.
Write down 5 as next digit of the result. 
Result so far: 131498.39875
Deduct 1605 from 1730 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Step 14:
When dividing 1250 by 321, we get 3 with a remainder of 287.
Write down 3 as next digit of the result. 
Result so far: 131498.398753
Deduct 963 from 1250 and we're left with 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

On to step 15:
321 can be fit into 2870 8 times, resulting in a remainder of 302.
The next digit of our result is 8. 
Result so far: 131498.3987538
If we subtract 2568 from 2870, we get 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Moving on to step 16:
The number 321 fits into 3020 9 times, leaving a remainder of 131.
Write down 9 as next digit of the result. 
Result so far: 131498.39875389
Deduct 2889 from 3020 and we're left with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

In conclusion, the division gives 131498.39875389 with a balance of 1.31e-07.