Question

How to simplify 2431 - 187

Answer 1

You take 187 away from 2431

Answer 2

Place the ones place straight to the ones place and the tens place straight to the tens place and hundreds place straight to the hundreds place and place the thousands place alone. Like this:
              2 4 3 1
                 1 8 7
Answer: 2 2 4 3
 
Hope it Helps!