Riddle: What do mathematics teachers like to eat?
Answer: Pi.
Riddle: What happened to the plant in the math classroom?
Answer: It grew square roots, of course.
Riddle: What do you call two math friends?
Answer: Algebros!!
Math Riddles
Riddle: What three whole, positive numbers have the same answer when multiplied together as when added together?
Answer: 1, 2 and 3.  1 x 2 x 3 = 1 + 2 + 3 = 6.
Riddle: Peter is 4 and his little brother is 2, half is age. How older will Peter's little brother be when he is 100?
Answer: 98 because there's only 2 year difference.
Math Riddles
Riddle: Take eight small sticks, four of which are half the length of the other four. How can you make three equal squares out of the sticks?
Answer: Use the longer four sticks to be sharing sides between the squares and at the end their should be three intertwined squares.
Riddle: What did one math book say to another?
Answer: I have so many problems.
Riddle: What is the next number in the series? 7,645 5,764 4,576...
Answer: 6,457. The last digit is moved to the front to make the next number.
Riddle: What arithmetic symbol can be put between 2 and 3 so that the resulting number is greater than 2 but less than 3?
Answer: A decimal point. 2.3 is greater than 2 and less than 3.
Riddle: If three cats catch three mice in three minutes, how many cats would be needed to catch 100 mice in 100 minutes?
Answer: The same three cats would do. Since these three cats are averaging one mouse per minute, given 100 minutes, the cats could catch 100 mice.
Riddle: A man is walking down a road with a basket of eggs. As he is walking he meets someone who buys one-half of his eggs plus one-half of an egg. He walks a little further and meets another person who buys one-half of his eggs plus one-half of an egg. After proceeding further he meets another person who buys one-half of his eggs plus one half an egg. At this point he has sold all of his eggs, and he never broke an egg. How many eggs did the man have to start with?
Answer: 7 eggs. The first person bought one half of his eggs plus one half an egg (3 1/2 + 1/2 = 4 eggs) This left him 3 eggs. The second person bought one-half of his eggs plus one half an egg, (1 1/2 + 1/2 = 2 eggs) leaving the man 1 egg. The last person bought one-half of his eggs plus one-half an egg, (1/2 + 1/2 = 1 egg) leaving no eggs.
Riddle: A new medical building containing 100 offices had just been completed. Mark was hired to paint the numbers 1 to 100 on the doors. How many times will Mark have to paint the number nine?
Answer: The answer is 20! 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99.
Riddle: I am a number but I am countless, I am compared with other things but nothing compares to me. What am I?
Answer: Infinity.........
Riddle: What table has not a leg to stand on?
Answer: The multiplication table or periodic table of elements.
Riddle: If a farmer has 5 haystacks in one field and 4 haystacks in the other field, how many haystacks would he have if he combined them all in another field?
Answer: One. He Combined them into one.
Riddle: If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?  
Answer: Twenty one. Most people would think there were 42 handshakes. The first person shakes the hand of 6 others, the second person shakes the hand of 5 remaining people, the third person shakes the hand of 4 remaining people, the fourth person shakes the hand of 3 remaining people, the 5th person shakes the hand of 2 remaining people and the sixth person shakes the hand of 1 remaining person. 6+5+4+3+2+1=21
Riddle: James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules there forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally, James would like the fishing rod to arrive in one piece!
Answer: Insert the fishing rod into a box which measures 4 feet on all sides, the fishing rod will fit within the diagonal of the box with room to spare.
Riddle: Does a ton of feathers or a ton of bricks weigh more?
Answer: They both weigh a ton.  
Riddle: I am a two-digit number. All my digits are even. No two digits are the same. None of my digits are prime numbers. I am not a multiple of ten. My tens digit is bigger than my other numbers. If you followed all the previous steps, there should be three options remaining the number is the option where if you add all the digits it's exactly in the middle (in how big the number is) of all the other options with their digits added together. What number am I?
Answer: If you followed all the steps apart from the last one there will be three options remaining: 64, 84, and 86. You then had to add up the digits, 64=6+4=10, 84=8+4=12, and 86=8+6=14. Finally, you then had to take up the middle biggest number (12) and put it back as it was before the digits were added together and your answer should be 84.
Riddle: What are three ways you can add 4 odd numbers and get ten?
Answer: 1+1+3+5=10 1+1+1+7=10 1+3+3+3=10