100 Math Riddles For Kids [with Answers & Free Printable] - Free Printable

- Remove the letters 'F' and 'E' from the word "FIVE". This leaves you with "IV", which is the Roman numeral for 4.
- You are adding 5 hours to 9 AM, which results in 2 PM. The riddle plays on the difference between numerical addition and time addition.
- The next number in the pattern is 21. Each number is the sum of the two preceding numbers (Fibonacci sequence: 2+3=5, 3+5=8, 5+8=13, 8+13=21).
- The four consecutive prime numbers are 47, 53, 59, and 61. Their sum is 47 + 53 + 59 + 61 = 220.
- The smallest whole number is 21. The sum of its digits is 2 + 1 = 3. Seven times this sum is 7 * 3 = 21, which equals the original number.
- The father has 9 children. He has 8 sons, and since each son has a sister, they all share the same one sister.
- Eight men can make 16 chairs in 8 hours. Since four men make four chairs in four hours, one man makes one chair in four hours. Therefore, eight men make eight chairs in four hours, and 16 chairs in eight hours.
- The man was born on February 29th, a date that occurs only once every four years. He would have had only 6 actual birthdays by the time he turned 24, making his 25th birthday occur at age 96.
- Bees love the hexagon because their honeycombs are made of hexagonal cells, which are the most efficient shape for storing honey and using the least amount of wax.