Riddle: Why is it easier to count cows than sheep?
Answer: You can use a cowculator.
Riddle: Find the four digit number in which the first digit is one fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3. What is it?
Answer: 1694.
Riddle: If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?
Answer: It's cheaper to take two friends at the same time. In this case, you would only be buying three tickets, whereas if you take the same friend twice you are buying four tickets.
Math Riddles
Riddle: What is the next number in the sequence? 2, 3, 5, 9, 17, _
Answer: 33. The pattern:  Double the previous number and subtract 1.
Riddle: In a stable there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable?
Answer: 14 horses and 8 men. 14x4 plus 8x2 = 72 feet.
Math Riddles
Riddle: Something very extraordinary happened on the 6th of May, 1978 at 12:34 a.m. What was it?
Answer: At that moment, the time and day could be written as: 12:34, 5/6/78.
Riddle: Take two numbers, such that the square of the first, plus the square of the second, shall equal 8; while the first, plus the product of the first and second, shall equal 6. What are the two numbers?
Answer: 2 and 2.
Math Riddles
Riddle: What two whole, postive numbers have the same answer when multiplied together as when added together?
Answer: 2 and 2.
Riddle: When my father was 31 I was 8. Now he is twice as old as me. How old am I?
Answer: The difference in age is 23 years, so I must be 23 if my father is twice as old as me.
Riddle: What is the most useful instrument in a mathematics teacher's tool kit?
Answer: Multi-pilers!