Math Delights

 What’s the difference between a two-digit number and its reverse?

Choose a two-digit number, e.g., 20. Make a new number by reversing the digits, e.g., 02. Subtract the smaller number from the larger number, e.g., 20 - 02 = 18. Check your subtraction by adding your result, e.g., 18 + 02 = 20. Do you notice a pattern? If not, choose another two-digit number and go back to step 1.

On the basis of your findings, see if you can predict the difference between a two-digit number and its reverse.

For more of a challenge, investigate three-digit numbers.