357821 ÷ 20 
We're looking to find how many times 20 goes into 357821.

On to step 1:
The number 20 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 20

On to step 2:
20 can be fit into 35 1 times, resulting in a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 20 from 35 and we're left with 15.
Include the next digit (7) from the dividend after 15, then repeat: 157 / 20

Moving on to step 3:
20 can be fit into 157 7 times, resulting in a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we take 140 away from 157, we end up with 17.
Include the next digit (8) from the dividend after 17, then repeat: 178 / 20

Advancing to step 4:
20 can be fit into 178 8 times, resulting in a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 178.0
If we subtract 160 from 178, we get 18.
Append the next digit (2) from the dividend to 18 and continue with: 182 / 20

Moving on to step 5:
182 divided by 20 is 9 with a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 1789.0
If we subtract 180 from 182, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 20

Step 6:
20 can be fit into 21 1 times, resulting in a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 17891.0
The remainder is 1 after subtracting 20 from 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
20 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 17891.0
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
When dividing 100 by 20, we get 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 17891.05
Subtracting 100 from 100 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
If we divide 0 by 20, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17891.05
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17891.05
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 17891.05 and a remainder of 0.0.