How many four-digit palindromes exist?

If Roberto was born on his grandmother’s birthday, how old are Roberto and his grandmother now?

How many of each kind of coin does Keith have in his secret pocket?

Find a decimal number that meets certain requirements.

How many shells does Ken have in his shell collection?

Place the numbers in the diagram’s squares in a special way to create a magic square.

Annie shoots three arrows that all land inside rings of an archery target. What were her three scores?

Determine the number of votes a particular candidate could have received.

In how many ways can you make change for a dollar using certain coins?

At what time will two traffic lights turn red together?