{
 "source": "https://peabody.kids/flashcards/fun-math-fun-facts",
 "id": "fun-math-fun-facts",
 "title": "Number and Math Fun Facts",
 "category": "trivia-fun",
 "subject": "Fun Facts",
 "levels": [
  "3-5",
  "6-8",
  "9-12"
 ],
 "description": "Surprising and fun facts about numbers and shapes.",
 "tags": [
  "math",
  "numbers",
  "fun facts"
 ],
 "frontLabel": "Question",
 "backLabel": "Answer",
 "cards": [
  [
   "What is a googol?",
   "The number 1 followed by 100 zeros"
  ],
  [
   "What is pi?",
   "About 3.14159, the ratio of a circle's circumference to its diameter"
  ],
  [
   "When is Pi Day?",
   "March 14 (3/14)"
  ],
  [
   "What is the only even prime number?",
   "2"
  ],
  [
   "What is a prime number?",
   "A number greater than 1 with only two factors: 1 and itself"
  ],
  [
   "What are the first five prime numbers?",
   "2, 3, 5, 7, 11"
  ],
  [
   "What is a perfect number?",
   "A number equal to the sum of its smaller factors, like 6 (1+2+3)"
  ],
  [
   "What is the next perfect number after 6?",
   "28"
  ],
  [
   "What is a square number?",
   "The result of a number times itself, like 25"
  ],
  [
   "What are the first five square numbers?",
   "1, 4, 9, 16, 25"
  ],
  [
   "What is a cube number?",
   "A number times itself twice, like 27"
  ],
  [
   "What is the Fibonacci sequence?",
   "1, 1, 2, 3, 5, 8, 13... each number is the sum of the previous two"
  ],
  [
   "Where do Fibonacci numbers show up in nature?",
   "In spirals of sunflowers, pinecones and shells"
  ],
  [
   "What is the golden ratio?",
   "About 1.618, a special ratio found in art and nature"
  ],
  [
   "Who is the father of geometry?",
   "Euclid"
  ],
  [
   "What is the Pythagorean theorem?",
   "In a right triangle, a squared plus b squared equals c squared"
  ],
  [
   "How many degrees in a circle?",
   "360"
  ],
  [
   "How many degrees in a triangle's angles?",
   "180"
  ],
  [
   "How many degrees in a right angle?",
   "90"
  ],
  [
   "How many sides does a hexagon have?",
   "Six"
  ],
  [
   "How many sides does an octagon have?",
   "Eight"
  ],
  [
   "What shape is a honeycomb cell?",
   "A hexagon"
  ],
  [
   "What is a polygon?",
   "A closed shape with straight sides"
  ],
  [
   "What is a number with no end after the decimal and no pattern?",
   "An irrational number, like pi"
  ],
  [
   "What is zero?",
   "The number that means none, invented in India"
  ],
  [
   "Who invented our digits 0 to 9?",
   "They came from India and spread through the Arab world (Hindu-Arabic numerals)"
  ],
  [
   "What number system do computers use?",
   "Binary, using 0 and 1"
  ],
  [
   "What is 1,000,000 called?",
   "A million"
  ],
  [
   "What is 1,000,000,000 called?",
   "A billion"
  ],
  [
   "What is 1,000,000,000,000 called?",
   "A trillion"
  ],
  [
   "What is a dozen?",
   "Twelve"
  ],
  [
   "What is a gross?",
   "144, or twelve dozen"
  ],
  [
   "What is a score?",
   "Twenty"
  ],
  [
   "How many seconds in a minute?",
   "60"
  ],
  [
   "How many minutes in an hour?",
   "60"
  ],
  [
   "How many hours in a day?",
   "24"
  ],
  [
   "How many days in a year?",
   "365 (366 in a leap year)"
  ],
  [
   "How many weeks in a year?",
   "52"
  ],
  [
   "What are Roman numerals for 1, 5, 10, 50, 100?",
   "I, V, X, L, C"
  ],
  [
   "What is the Roman numeral for 500?",
   "D"
  ],
  [
   "What is the Roman numeral for 1,000?",
   "M"
  ],
  [
   "What is 12 x 12?",
   "144"
  ],
  [
   "What is 9 x 9?",
   "81"
  ],
  [
   "What is 7 x 8?",
   "56"
  ],
  [
   "What happens when you add the digits of a multiple of 9?",
   "The digits add up to a multiple of 9"
  ],
  [
   "What is the 9s trick on fingers?",
   "Fold down the finger for the number; fingers left of it are tens and right are ones"
  ],
  [
   "What is a tessellation?",
   "A pattern of shapes that fit together with no gaps"
  ],
  [
   "What shape tiles a floor without gaps?",
   "Squares, triangles and hexagons"
  ],
  [
   "What is symmetry?",
   "When one half of a shape mirrors the other"
  ],
  [
   "How many lines of symmetry does a square have?",
   "Four"
  ],
  [
   "How many lines of symmetry does a circle have?",
   "Endless"
  ],
  [
   "What is an average?",
   "The sum of numbers divided by how many there are"
  ],
  [
   "What is a mean, median and mode?",
   "Average, middle value, and most common value"
  ],
  [
   "What does 'infinity' mean?",
   "Without end"
  ],
  [
   "What is the symbol for infinity?",
   "A sideways eight"
  ],
  [
   "What is the Möbius strip?",
   "A one-sided loop made by twisting a paper strip and joining its ends"
  ],
  [
   "Who was Ada Lovelace?",
   "An early thinker about computer programs in the 1840s"
  ],
  [
   "Who was Carl Friedrich Gauss?",
   "A German mathematician; as a boy he quickly added 1 to 100"
  ],
  [
   "What is the sum of 1 to 100?",
   "5,050"
  ],
  [
   "What is 1 + 2 + 3 + 4 + 5?",
   "15"
  ],
  [
   "Why is a circle special?",
   "Every point on it is the same distance from the center"
  ],
  [
   "How many cents in a dollar?",
   "100"
  ],
  [
   "What is a percent?",
   "Out of 100"
  ],
  [
   "What is 50 percent of 80?",
   "40"
  ],
  [
   "What number is half of 100?",
   "50"
  ],
  [
   "What is the biggest 3-digit number?",
   "999"
  ]
 ]
}