We're dividing 16821458 by 850 
We're looking to find how many times 850 goes into 16821458.

Step 1:
When dividing 1 by 850, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 850

Going ahead to step 2:
When dividing 16 by 850, we get 0 with a remainder of 16.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 16 to get 16.
Include the next digit (8) from the dividend after 16, then repeat: 168 / 850

Step 3:
When dividing 168 by 850, we get 0 with a remainder of 168.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 168 after subtracting 0 from 168.
Append the next digit (2) from the dividend to 168 and continue with: 1682 / 850

Advancing to step 4:
When dividing 1682 by 850, we get 1 with a remainder of 832.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 850 away from 1682, we end up with 832.
Append the next digit (1) from the dividend to 832 and continue with: 8321 / 850

Let's proceed to step 5:
If we divide 8321 by 850, we get 9 and a remainder of 671.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
If we subtract 7650 from 8321, we get 671.
Grab the next digit (4) from the dividend, add it to 671, then carry on: 6714 / 850

Step 6:
The number 850 fits into 6714 7 times, leaving a remainder of 764.
The next digit of our result is 7. 
Result so far: 197.0
The remainder is 764 after subtracting 5950 from 6714.
Include the next digit (5) from the dividend after 764, then repeat: 7645 / 850

Going ahead to step 7:
The number 850 fits into 7645 8 times, leaving a remainder of 845.
Write down 8 as next digit of the result. 
Result so far: 1978.0
The remainder is 845 after subtracting 6800 from 7645.
Take the next digit (8) from the dividend and append it to 845, then repeat: 8458 / 850

Let's proceed to step 8:
8458 divided by 850 is 9 with a remainder of 808.
Write down 9 as next digit of the result. 
Result so far: 19789.0
The remainder is 808 after subtracting 7650 from 8458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8080, and continue the process.

Advancing to step 9:
The number 850 fits into 8080 9 times, leaving a remainder of 430.
Use 9 as the next digit of our solution. 
Result so far: 19789.9
If we take 7650 away from 8080, we end up with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Advancing to step 10:
If we divide 4300 by 850, we get 5 and a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 19789.95
If we take 4250 away from 4300, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 11:
When dividing 500 by 850, we get 0 with a remainder of 500.
Record the quotient 0 as the next digit in the result. 
Result so far: 19789.95
If we subtract 0 from 500, we get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Step 12:
The number 850 fits into 5000 5 times, leaving a remainder of 750.
Record the quotient 5 as the next digit in the result. 
Result so far: 19789.9505
If we subtract 4250 from 5000, we get 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Moving on to step 13:
If we divide 7500 by 850, we get 8 and a remainder of 700.
Use 8 as the next digit of our solution. 
Result so far: 19789.95058
Deduct 6800 from 7500 and we're left with 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Advancing to step 14:
7000 divided by 850 is 8 with a remainder of 200.
Record the quotient 8 as the next digit in the result. 
Result so far: 19789.950588
Subtract 6800 from 7000 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The final outcome is 19789.950588, with a leftover of 2e-05.