Maths for Kids / Maths is Not Boring: The Kids Maths Podcast
von Kidopoly
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Averages for Kids: Why No One Is Average in Every Way
The story of averages for kids: how around 1950 Gilbert Daniels measured 4,063 United States Air Force pilots and found that not one was average in every way. • Why cockpits built for the average pilot fitted nobody • What an average tells
Binary for Kids: How Computers Count With Only 1s and 0s
The story of binary for kids: how Gottfried Wilhelm Leibniz wrote out a way of counting with only 0 and 1 in 1679, long before computers. • How to count one, two, three and four in binary • How Leibniz published his work in Paris in 1703 •
Triangles for Kids: Why the Strongest Shape Has Three Sides
The story of triangles for kids: why a triangle will not squash flat when a square does, and how Gustave Eiffel built his tower in Paris from triangles in 1889. • What engineers mean by rigidity • How more than 18,000 iron pieces in the Eif
Googol for Kids: What a Googol Is and Who Named It
The story of the googol for kids: how nine-year-old Milton Sirotta named the number one followed by a hundred zeros for his uncle, mathematician Edward Kasner, around 1920. • Why a googol is bigger than the number of atoms in the known univ
Fractions for Kids: How the Ancient Egyptians Shared Bread
The story of fractions for kids: how the Egyptian scribe Ahmes wrote down problems about sharing loaves of bread fairly about 3,500 years ago, in the scroll now called the Rhind papyrus. • How the Egyptians built fractions from pieces with
Tessellation for Kids: How Tiles Cover a Floor With No Gaps
The story of tessellation for kids: shapes that cover a floor with no gaps, and how David Smith from Bridlington in Yorkshire found a tile in 2022 whose pattern never repeats. • Why squares, triangles and hexagons make repeating patterns •
The Equals Sign for Kids: Who Invented It and What It Means
The story of the equals sign for kids: how Welsh doctor Robert Recorde drew two parallel lines in his 1557 book The Whetstone of Witte. • Why Recorde chose two lines of the same length • How his book was the first in English to use plus and
The Law of Large Numbers for Kids: Why Coin Tosses Even Out
The story of the law of large numbers for kids: how John Kerrich tossed a coin 10,000 times during the Second World War, and how Jacob Bernoulli explained the result in a book published in 1713. • Why Kerrich's 5,067 heads is so close to ha
Negative Numbers for Kids: How Numbers Go Below Zero
The story of negative numbers for kids: numbers below zero, from Chinese counting rods about 2,000 years ago to Brahmagupta's rules in India in 628 CE. • How Chinese mathematicians used red and black rods in The Nine Chapters • Why many Eur
Fractals for Kids: Why the Coastline of Britain Never Ends
The story of fractals for kids: why the coast of Britain gets longer the shorter your ruler, and how Benoit Mandelbrot asked the coastline question in 1967. • How Lewis Fry Richardson found two different lengths for the Spain and Portugal b
Place Value for Kids: Why We Count in Tens
The story of place value for kids: why ten fingers mean most of the world counts in tens, and how the system we use today grew up in India. • How the Babylonians counted in sixties, which is why an hour has 60 minutes • Why the Maya counted
The Fourth Dimension for Kids: How to Picture a 4D Shape
The story of Flatland and the fourth dimension for kids: Edwin Abbott Abbott's 1884 book about a square who lives in a flat world and meets a sphere. • What a sphere looks like when it passes through a flat world • How the sphere lifts the
The Pigeonhole Principle for Kids: Why Two Pigeons Must Share
The story of the pigeonhole principle for kids: why two people in London must have the same number of hairs on their heads, and how Peter Dirichlet set out the rule in 1834. • Why more pigeons than pigeonholes means two must share • How a F
The Monty Hall Problem for Kids: Why Switching Doors Wins
The story of the Monty Hall problem for kids: three doors, one car and two goats, and how Marilyn vos Savant explained in 1990 why switching wins twice as often. • Why your first pick has only a one in three chance • How the host's open doo
The Four Colour Theorem for Kids: Why Maps Need Four Colours
The story of the Four Colour Theorem for kids: how student Francis Guthrie noticed in 1852 that four colours are enough for any map, and how it took until 1976 to prove it. • How Alfred Kempe's 1879 proof was believed until Percy Heawood fo
The Seven Bridges of Königsberg for Kids: How Euler Solved It
The story of the seven bridges of Königsberg for kids: the Sunday walk nobody could finish, and how Leonhard Euler showed why in 1735 by drawing the first network. • How Euler swapped the city for dots and lines • Why every piece of land ne
Exponential Growth for Kids: How 42 Paper Folds Reach the Moon
The story of exponential growth for kids: why folding a sheet of paper 42 times would reach the Moon, and how Britney Gallivan set the folding record in California in 2002. • How Britney Gallivan folded a single sheet of paper in half twelv
Zero for Kids: How People Invented a Number for Nothing
The story of zero for kids: how Brahmagupta in India wrote down the first rules for zero as a number in 628 CE, and how it travelled to Europe. • How the Babylonians and the Maya used a mark to hold an empty place open • Brahmagupta's rules
Symmetry for Kids: Why a Snowflake Has Six Matching Arms
The story of symmetry for kids: why a snowflake looks unchanged when you turn it, and how Emmy Noether showed in Germany in 1915 that symmetry hides the laws of physics. • How flips, turns and slides show up in butterflies, starfish and hon
Prime Numbers for Kids: What Primes Are and Why They Never End
The story of prime numbers for kids: numbers like 2, 3, 5, 7 and 11 that only split into ones, and how Euclid of Alexandria proved around 300 BCE that they never run out. • How Euclid's argument shows there can never be a biggest prime • Th
The Mobius Strip for Kids: How a Shape Can Have Only One Side
The story of the Mobius strip for kids: how one twist in a loop of paper makes a shape with only one side, and how August Mobius described it in Germany in 1858. • How to make a Mobius strip and trace its one side with a finger • Why Johann
Permutations for Kids: Why Every Card Shuffle Is Brand New
The story of permutations for kids: why a well shuffled pack of 52 cards is almost certainly in an order no one has ever held before, and how Dave Bayer and Persi Diaconis studied shuffling in 1992. • Why seven riffle shuffles are enough to
Infinity for Kids: What Infinity Is and Why Some Are Bigger
The story of infinity for kids: why there is no biggest number, and how Georg Cantor showed in the 1870s that some infinities are bigger than others. • How the even numbers pair up with all the whole numbers, one to one • Hilbert's Hotel, w
The Birthday Paradox for Kids: Why 23 People Share a Birthday
The story of the birthday paradox for kids: why in a room of just 23 people it is more likely than not that two share a birthday, and how Richard von Mises published the idea in 1939. • Why the question is about any two people, not about ma
Pi for Kids: What Pi Is and Why Every Circle Has It
The story of pi for kids: why the distance around any circle is always a little more than three times the distance across, and how Archimedes of Syracuse pinned the number down around 250 BCE. • How Archimedes trapped pi between shapes with
