Quick Math Riddles

Riddle Solution

• The missing number is seven; it is odd.
• Removing the letter 's' from "seven" transforms it to "even," which denotes even numbers.

Sum of Positive Integers

• The sum of the first ten positive integers (1 through 10) is 55.
• This can be calculated using the formula for the sum of an arithmetic series: ( n(n + 1)/2 ).

Value of Pi

• The value of pi (π) is approximately 3.14 to two decimal places.
• It represents the ratio of the circumference of a circle to its diameter.

Prime Number Identification

• A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself.
• Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, etc.

Engage your mind with these fun and quick math riddles! Test your math skills with five intriguing riddles, each with three options but only one correct answer. Have fun and challenge yourself with these entertaining math puzzles.