# Hard Math trivia

Hard Math Trivia! It says what it is in the title.
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DIFFICULTYHARD

1
What is the correct mathematical name of this: - (it is a division bar)
• Vinculum
• Virgule
• Obelus
• Octothorpe
• 2
What is the correct mathematical name of this: # (a hash or number sign)
• Vinculum
• Virgule
• Obelus
• Octothorpe
• 3
What is the correct mathematical name of this: / (division slash)
• Vinculum
• Virgule
• Obelus
• Octothorpe
• 4
What is the correct mathematical name of this: ÷ (division sign)
• Vinculum
• Virgule
• Obelus
• Octothorpe
• 5
What digit did Arab mathematician al-Khwarizmi give to the West around 800 B/B.?
• Zero
• One
• Two
• Three
• 6
What two letters are both symbols for 1,000?
• K and T
• T and M
• K and M
• M and O
• 7
What century did mathematicians first use plus and minus signs?
• Sixteenth
• Seventeenth
• Egighteenth
• Fifteenth
• 8
What number, a one followed by 100 zeros, was first used by nine-year-old Milton Sirotta in 1940?
• Googol
• Trillion
• Zillion
• Nillion
• 9
How many equal sides does an icosahedron have?
• Ten
• Twenty
• Twenty Five
• Thirty
• 10
What number does "giga" stand for?
• A million
• A billion
• A googol
• A trillion
• Unanswered questions will be marked as wrong