Fascinating Maths Facts
 If you write out pi to two decimal places, backwards it spells “pie”
 The spiral shapes of sunflowers follow a Fibonacci sequence.
 That’s where you add the two preceding numbers in the sequence to give you the next one. So it starts 1, 1, 2, 3, 5, 8, 13, 21, etc. The Fibonacci sequence shows up in nature a fair bit.
 The Fibonacci sequence is encoded in the number 1/89.
1/89 = 0.01 + 0.001 + 0.0002 + 0.00003 + 0.000005 + 0.0000008 + 0.00000013 + 0.000000021 + 0.0000000034 etc.
 A pizza that has radius “z” and height “a” has volume Pi × z × z × a.
Because the area of a circle is Pi multiplied by the radius squared (which can be written out as Pi × z × z). Then you multiply by the height to get the total volume.
 111,111,111 × 111,111,111 = 12,345,678,987,654,321
 It also works for smaller numbers: 111 × 111 = 12321.
 Zero is the only number that can’t be represented in Roman numerals
 We tend to think of odd numbers as male and even numbers as female.
This ancient belief was tested by James Wilkie and Galen Bodenhausen of Northwestern University. In his latest book, Alex Bellos writes: “They showed respondents randomly assigned pictures of the faces of young babies, each next to a threedigit number that was either oddoddodd or eveneveneven, and asked them to guess the baby’s sex […] Respondents were about 10 per cent more likely to say that a baby paired with odd numbers was a boy, than if the same baby was paired with even numbers.”
 Zero is an even number.
 There’s not enough space in the known universe to write out a googolplex on paper.
According to Carl Sagan in the original Cosmos series. A googolplex is 10 to the power of a googol, or 10 to the power of 10 to the power of 100.
 The most popular favourite number is 7
.Nearly 3000 people, around 10% of the total asked, chose 7 as their favourite number in an online poll by Alex Bellos. The second most popular was 3.
We have seven deadly sins, and seven wonders of the world. Not to mention colours of the rainbow, pillars of wisdom, seas, dwarves, days in the week…
This might be because when these things came about there were celestial bodies visible in the sky (the Sun, the Moon, Venus, Mercury, Mars, Jupiter and Saturn).
 10! seconds is exactly 6 weeks.
10! means 10 factorial. 10! = 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 3628800 seconds. Which is 42 days, or 6 weeks, exactly.
 1274953680 has two odd things about it: it uses all the digits 09 AND you can divide it exactly by any number from 116
 If you multiply 21978 by 4 it turns backwards
 8 is the only cube that is 1 less than a square
