✨ 30 fun maths facts
30 fun maths facts, all true and easy to check
Maths is full of surprises. Each of these facts is true, and many you can check yourself with a pencil or a calculator.
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How to play
- Check a fact with your own numbers. That is how mathematicians learn.
- Pick a favourite and explain it to someone at home.
- Look for patterns of your own.
- 1 + 2 + 3 + ... + 100 = 5050. The young Gauss is said to have found this by pairing numbers.
- 2 is the only even prime number.
- 1 is neither prime nor composite.
- A googol is the number 1 followed by 100 zeros.
- 111,111,111 × 111,111,111 = 12,345,678,987,654,321.
- Multiply 142857 by 2, 3, 4, 5 or 6 and you get the same six digits in a different order.
- A number is divisible by 3 if the sum of its digits is divisible by 3.
- Divide any circle's circumference by its diameter and you always get pi, about 3.14159.
- Zero is an even number.
- Roman numerals have no symbol for zero.
- 6 is a perfect number because 1 + 2 + 3 = 6, and so is 28 because 1 + 2 + 4 + 7 + 14 = 28.
- Indian mathematicians such as Brahmagupta wrote rules for using zero in the 7th century.
- Aryabhata, born in 476 CE, gave a value of pi as 3.1416.
- Ramanujan noticed that 1729 is the smallest number that is the sum of two cubes in two different ways: 1³ + 12³ and 9³ + 10³.
- A Rubik's Cube has 43,252,003,274,489,856,000 possible positions.
- The angles of any triangle add up to 180 degrees.
- Squares, triangles and hexagons can all cover a flat surface with no gaps.
- There are 86,400 seconds in a day.
- Computers use only 0 and 1, and 8 bits make a byte.
- A dozen is 12 and a gross is 144, which is a dozen dozens.
- The digits of 9 × 1, 9 × 2 up to 9 × 10 always add up to 9.
- In the Fibonacci sequence 1, 1, 2, 3, 5, 8, 13, each number is the sum of the two before it.
- Since 7 × 11 × 13 = 1001, any number like 456456 is divisible by 7, 11 and 13.
- Pi has infinitely many digits and they never settle into a repeating pattern.
- The sum of the first n odd numbers is always n squared: 1 + 3 + 5 + 7 = 16.
- The equals sign was introduced by Robert Recorde in 1557, because two parallel lines are as equal as two things can be.
- A number is divisible by 4 if its last two digits make a number divisible by 4.
- The word calculate comes from the Latin word for a small stone, because stones were once used for counting.
- Many of the largest known prime numbers are Mersenne primes, found with computers.
- In India, 1 lakh is 100,000 and 1 crore is 10,000,000.
FAQ
Fun maths facts for kids: questions people ask
Are these facts checked?
Yes. Each one is a standard mathematical fact. We also check the calculations by computer.
What age are they for?
Ages 8 and up. Younger children will enjoy the number patterns.
Where can I find more?
Try our maths magic tricks and number puzzles.
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