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Number and Math Fun Facts
Surprising and fun facts about numbers and shapes.
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66 cards
- What is a googol?QuestionThe number 1 followed by 100 zeros
- What is pi?QuestionAbout 3.14159, the ratio of a circle's circumference to its diameter
- When is Pi Day?QuestionMarch 14 (3/14)
- What is the only even prime number?Question2
- What is a prime number?QuestionA number greater than 1 with only two factors: 1 and itself
- What are the first five prime numbers?Question2, 3, 5, 7, 11
- What is a perfect number?QuestionA number equal to the sum of its smaller factors, like 6 (1+2+3)
- What is the next perfect number after 6?Question28
- What is a square number?QuestionThe result of a number times itself, like 25
- What are the first five square numbers?Question1, 4, 9, 16, 25
- What is a cube number?QuestionA number times itself twice, like 27
- What is the Fibonacci sequence?Question1, 1, 2, 3, 5, 8, 13... each number is the sum of the previous two
- Where do Fibonacci numbers show up in nature?QuestionIn spirals of sunflowers, pinecones and shells
- What is the golden ratio?QuestionAbout 1.618, a special ratio found in art and nature
- Who is the father of geometry?QuestionEuclid
- What is the Pythagorean theorem?QuestionIn a right triangle, a squared plus b squared equals c squared
- How many degrees in a circle?Question360
- How many degrees in a triangle's angles?Question180
- How many degrees in a right angle?Question90
- How many sides does a hexagon have?QuestionSix
- How many sides does an octagon have?QuestionEight
- What shape is a honeycomb cell?QuestionA hexagon
- What is a polygon?QuestionA closed shape with straight sides
- What is a number with no end after the decimal and no pattern?QuestionAn irrational number, like pi
- What is zero?QuestionThe number that means none, invented in India
- Who invented our digits 0 to 9?QuestionThey came from India and spread through the Arab world (Hindu-Arabic numerals)
- What number system do computers use?QuestionBinary, using 0 and 1
- What is 1,000,000 called?QuestionA million
- What is 1,000,000,000 called?QuestionA billion
- What is 1,000,000,000,000 called?QuestionA trillion
- What is a dozen?QuestionTwelve
- What is a gross?Question144, or twelve dozen
- What is a score?QuestionTwenty
- How many seconds in a minute?Question60
- How many minutes in an hour?Question60
- How many hours in a day?Question24
- How many days in a year?Question365 (366 in a leap year)
- How many weeks in a year?Question52
- What are Roman numerals for 1, 5, 10, 50, 100?QuestionI, V, X, L, C
- What is the Roman numeral for 500?QuestionD
- What is the Roman numeral for 1,000?QuestionM
- What is 12 x 12?Question144
- What is 9 x 9?Question81
- What is 7 x 8?Question56
- What happens when you add the digits of a multiple of 9?QuestionThe digits add up to a multiple of 9
- What is the 9s trick on fingers?QuestionFold down the finger for the number; fingers left of it are tens and right are ones
- What is a tessellation?QuestionA pattern of shapes that fit together with no gaps
- What shape tiles a floor without gaps?QuestionSquares, triangles and hexagons
- What is symmetry?QuestionWhen one half of a shape mirrors the other
- How many lines of symmetry does a square have?QuestionFour
- How many lines of symmetry does a circle have?QuestionEndless
- What is an average?QuestionThe sum of numbers divided by how many there are
- What is a mean, median and mode?QuestionAverage, middle value, and most common value
- What does 'infinity' mean?QuestionWithout end
- What is the symbol for infinity?QuestionA sideways eight
- What is the Möbius strip?QuestionA one-sided loop made by twisting a paper strip and joining its ends
- Who was Ada Lovelace?QuestionAn early thinker about computer programs in the 1840s
- Who was Carl Friedrich Gauss?QuestionA German mathematician; as a boy he quickly added 1 to 100
- What is the sum of 1 to 100?Question5,050
- What is 1 + 2 + 3 + 4 + 5?Question15
- Why is a circle special?QuestionEvery point on it is the same distance from the center
- How many cents in a dollar?Question100
- What is a percent?QuestionOut of 100
- What is 50 percent of 80?Question40
- What number is half of 100?Question50
- What is the biggest 3-digit number?Question999
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