Math Riddles
I’m an odd number. Take away one letter, and I become even. What am I?
Seven
This ancient civilization is credited with creating the first known numeral system.
Mesopotamians (Babylonians)
What is 25% of 200?
50
What is the sum of the interior angles of a triangle?
180 degrees
If a train travels 60 miles in 1 hour, how far will it travel in 7.5 hours?
450 miles
What comes once in a minute, twice in a moment, but never in a thousand years?
The letter "M"
From what country was the number zero created?
Indis
What is the least common multiple (LCM) of 6 and 8?
24
A rectangle has a length of 8 and a width of 5. What is its diagonal?
√(8² + 5²) = √89
What is the only even prime number?
2
A farmer has 17 sheep, and all but 9 run away. How many are left?
Nine
What ancient tool, sometimes called a "counting frame," was used for calculations?
Abacus
A number has exactly three factors: 1, itself, and one other number. What kind of number is it or what is an example?
A perfect square of a prime number, e.g., 9 (3²).
What is the name of a 12-sided polygon?
Dodecagon
The Fibonacci sequence starts with 0, 1, 1, 2, 3. What is the 10th number in the sequence?
34
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?
194
What Greek mathematician is known as the "Father of Geometry"?
Euclid
Palindrome is a number that reads the same backward and forward. What is the smallest three-digit palindrome divisible by 18?
252
A circle has a circumference of 31.4 units. What is its radius?
5 units (C = 2πr → 31.4 = 2 × 3.14 × r)
What is the smallest number greater than 1 that is both a square and a cube?
64 (2⁶ = 4² = 8³).