ShareYourGroupShareYourGroupGK

Maths facts: GK questions and answers

These are the facts of mathematics that quizzes ask: famous numbers, shapes, great mathematicians and the Indian system of lakhs and crores. No working is needed, only clear ideas.

Test yourself

Ten questions picked at random from this topic, four choices each. Or go through every question as flash cards.

20 questions on maths facts

  1. Which is the smallest prime number? 2 It is also the only even prime number. The number 1 is not counted as prime.
  2. Which Indian mathematician of the 7th century gave rules for calculating with zero? Brahmagupta He treated zero as a number in its own right.
  3. What is the value of pi, correct to two decimal places? 3.14 The fraction 22/7 is a close value often used in school.
  4. Pi is the circumference of a circle divided by its what? Diameter The answer is the same for every circle, large or small.
  5. What is the distance around a circle called? Circumference It is the perimeter of the circle.
  6. What is the sum of the angles of a triangle? 180° This is true of every triangle drawn on a flat surface.
  7. What is the sum of the angles of a quadrilateral? 360° A quadrilateral can be cut into two triangles: 180° and 180°.
  8. How many degrees are there in a right angle? 90° The corner of a square is a right angle.
  9. How many sides does a hexagon have? Six The cells of a honeycomb are hexagons.
  10. What is a polygon with eight sides called? Octagon Think of an octopus, which has eight arms.
  11. What is the longest side of a right-angled triangle called? Hypotenuse It is the side opposite the right angle.
  12. The rule a² + b² = c² for a right-angled triangle is named after whom? Pythagoras The same rule is found in the ancient Indian Sulba Sutras of Baudhayana.
  13. Who is called the father of geometry? Euclid His book is called the "Elements".
  14. Which Roman numeral stands for 50? L C stands for 100 and X for 10.
  15. Which Roman numeral stands for 1,000? M D stands for 500.
  16. How many zeros are there in one lakh? Five One lakh is written 1,00,000.
  17. How many zeros are there in one crore? Seven One crore is written 1,00,00,000.
  18. One million is equal to how many lakhs? Ten One million is 10,00,000. Ten million make one crore.
  19. Which number is known as the Hardy-Ramanujan number? 1729 It is the smallest number that is the sum of two cubes in two different ways.
  20. On which date is National Mathematics Day observed in India? 22 December It is the birthday of Srinivasa Ramanujan.

These are well-established facts, written in our own words and last checked on 11 November 2026. If your textbook says something different, follow your textbook and tell us.

More topics

Daily quiz All topics