If you multiply this number by any other number, the answer will always be the same. What number is this?

There are two ducks in front of two other ducks. There are two ducks behind two other ducks. There are two ducks beside two other ducks. How many ducks are there?

What 3 positive numbers give the same result when multiplied together as when added together?

How can you add eight 8's to get the number 1,000? (only use addition)

What do you get when you divide 30 by 1/2 and add 10?

The ages of a father and son add up to 66. The father's age is the son's age reversed. How old could they be (there are 3 possible solutions)?

Two fathers and two sons go fishing. Each of them catches one fish. So why do they bring home only three fish?

The combined age of Jack and John is 49. Jack is twice as old, as John was when Jack was as old as John is now. How old are the brothers?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

0, 1, 2, 3, 4, ... are a set of ...... numbers.

I asked a girl how old she was. She said, "In 2 years I will be twice as old as I was 5 years ago." How old is she?

..., -3, -2, -1, 0, 1, 2, 3, ... are a set of ..... .