Question Video: Writing Algebraic Expressions | Nagwa Question Video: Writing Algebraic Expressions | Nagwa

# Question Video: Writing Algebraic Expressions Mathematics • First Year of Preparatory School

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Write an expression for double a number ๐.

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### Video Transcript

Write an expression for double a number ๐.

First, letโs think about the word โdouble.โ What does โdoubleโ mean mathematically? If you have a double an amount, you have two times that amount. Our number is ๐. If we have double a number ๐, we have two times the number ๐. Two times can be written like this: two ๐ฅ. Bring down the ๐. So we have two times ๐.

And thereโs one other way we can simplify this expression. When weโre multiplying a variable by a number, we donโt need the multiplication symbol. We write the two next to the ๐. And that means two times ๐. This expression represents double the number ๐, two times ๐.

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