Math quiz riddle questions and answers

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Here are some math quiz riddle questions along with their answers:

1. Riddle: I am an odd number. Take away one letter, and I become even. What number am I?
   
   • Answer: Seven. (Take away the "S," and it becomes "even.")
2. Riddle: If two's company, and three's a crowd, what are four and five?
   
   • Answer: Nine.
3. Riddle: I add five to nine and get two. The answer is correct, but how?
   
   • Answer: The time on a clock. 9 AM plus 5 hours equals 2 PM.
4. Riddle: I am a three-digit number. My tens digit is five more than my ones digit, and my hundreds digit is eight less than my tens digit. What number am I?
   
   • Answer: 194.
5. Riddle: A father’s age is four times that of his son. In 20 years, the father will be twice as old as his son. How old are they now?
   
   • Answer: The son is 10 years old, and the father is 40 years old.
6. Riddle: A man is twice as old as his little sister. He will be three times her age in 6 years. How old are they now?
   
   • Answer: The little sister is 6 years old, and the man is 12 years old.
7. Riddle: How can you make the number 7 even without addition, subtraction, multiplication, or division?
   
   • Answer: Drop the "S" in "Seven" to make it "Even."
8. Riddle: What three positive numbers give the same answer when multiplied and added together?
   
   • Answer: 1, 2, and 3. (1 + 2 + 3 = 6, and 1 × 2 × 3 = 6.)
9. Riddle: A person is 15 years old. In 15 years, they will be twice as old as they were 10 years ago. How old are they?
   
   • Answer: 15 years old.
10. Riddle: What has a head, a tail, is brown, and has no legs?
    
    • Answer: A penny (or a coin in general).

These riddles combine math with a bit of lateral thinking, making them fun and challenging!