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What number has the same number of letters as its meaning?
4 = four
What is the longest side of the right-angle triangle called?
The hypotenuse
What is the only number that does not have its Roman numeral?
0
What is the number of sides on a nonagon?
9
Who invented the use of negative numbers?
Chinese people
What is the sum of all the interior angles of a triangle?
180°
How many times can a sheet of paper be folded in half?
7
What is the only prime number that is even?
2
