13. Zero is not represented in Roman numerals.
14. The word “mathematics” only appears in one Shakespearean play, “The Taming of the Shrew”.
15. -40 °C is equal to -40 °F.
16. In France, a pie chart is sometimes referred to as a “camembert”.
17. The symbol for division (i.e.÷) is called an obelus.l
18. 2 and 5 are the only prime numbers that end in 2 or 5.
19. A ‘jiffy’ is an actual unit of time. It means 1/100th of a second
20. If you shuffle a deck of cards properly, it’s more than likely that the exact order of the cards you get has never been seen before in the whole history of the universe.
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