We look at the division of 151157 by 20 
We want to figure out the number of times 151157 can be divided by 20.

On to step 1:
The number 20 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 20

Step 2:
15 divided by 20 is 0 with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 20

On to step 3:
When dividing 151 by 20, we get 7 with a remainder of 11.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 140 from 151 to get 11.
Append the next digit (1) from the dividend to 11 and continue with: 111 / 20

Let's proceed to step 4:
If we divide 111 by 20, we get 5 and a remainder of 11.
Use 5 as the next digit of our solution. 
Result so far: 75.0
If we subtract 100 from 111, we get 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 20

Let's proceed to step 5:
20 goes into 115 5 times with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 755.0
Subtract 100 from 115 to get 15.
Include the next digit (7) from the dividend after 15, then repeat: 157 / 20

Advancing to step 6:
If we divide 157 by 20, we get 7 and a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 7557.0
Subtract 140 from 157 to 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.

Advancing to step 7:
20 can be fit into 170 8 times, resulting in a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 7557.8
Deduct 160 from 170 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
20 goes into 100 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 7557.85
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.

Going ahead to step 9:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 7557.85
The remainder is 0 after subtracting 0 from 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 10:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7557.85
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 outcome is 7557.85, with a leftover of 0.0.