Make Number One disappear

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?




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There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
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Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

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What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

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If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

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In a town, there are over 100 flats.
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Victor later founds that the local of the town have given it another name.

What is the name of the Flat?

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The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

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What is both possible and impossible at the same time?

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Crossword

The day before the 1996 U.S. presidential election, the NYT Crossword contained the clue “Lead story in tomorrow’s newspaper,” the puzzle was built so that both electoral outcomes were correct answers, requiring 7 other clues to have dual responses.