**1. If you write out pi to two decimal places, backwards it spells “pie”.**

3.14 = pie

**2. 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.

**3. 2,520 is the smallest number that can be exactly divided by all the numbers 1 to 10.**

**4. Zero is the only number that can’t be represented in Roman numerals.**

**5. 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.

**6. 555 is used by some in Thailand as slang for “hahaha”, because the word for “five” is pronounced “ha”.**

**7. Hundred(100) derives The word ‘hundrath’ in Old Norse, meant not 100 but 120.**

**8. Students who chew gum have better math test scores than those who do not, a study found.**

**9. There are just four numbers (after 1) which are the sums of the cubes of their digits.**

153 = 1^3 + 5^3 + 3^3

370 = 3^3 + 7^3 + 0^3

371 = 3^3 + 7^3 + 1^3

407 = 4^3 + 0^3 + 7^3

**10. The only number in English that is spelled with its letters in alphabetical order is ‘forty’.**

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