600857 ÷ 40 
We want to divide 600857 by 40.

Going ahead to step 1:
40 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 40

Advancing to step 2:
When dividing 60 by 40, we get 1 with a remainder of 20.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 40 from 60 to get 20.
Bring next digit (0) of the dividend behind the 20 and repeat the process: 200 / 40

Advancing to step 3:
If we divide 200 by 40, we get 5 and a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtract 200 from 200 to get 0.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 40

Step 4:
When dividing 8 by 40, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 150.0
Subtract 0 from 8 to get 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 40

Moving on to step 5:
When dividing 85 by 40, we get 2 with a remainder of 5.
The next digit of our result is 2. 
Result so far: 1502.0
Subtract 80 from 85 to get 5.
Grab the next digit (7) from the dividend, add it to 5, then carry on: 57 / 40

Advancing to step 6:
40 goes into 57 1 times with a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 15021.0
If we subtract 40 from 57, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 7:
40 can be fit into 170 4 times, resulting in a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 15021.4
Subtract 160 from 170 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.

Moving on to step 8:
When dividing 100 by 40, we get 2 with a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 15021.42
Deduct 80 from 100 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
When dividing 200 by 40, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 15021.425
If we take 200 away from 200, we end up 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 10:
40 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 15021.425
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.

Advancing to step 11:
0 divided by 40 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 15021.425
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.

The final result is 15021.425 with a remainder of 0.0.