Write down an algebraic expression for the following sentence: "A number multiplied by three"

To represent the sentence "A number multiplied by three" as an algebraic expression, we can break it down and follow these steps:

1. Identify the Variable

• Let's define the unknown number as a variable. We can use $x$ to represent this number.

2. Understand the Operation

• The phrase "multiplied by three" indicates that this number is being multiplied by the constant 3.

3. Construct the Expression

• Combining both aspects, we can create the algebraic expression.

Final Answer

The algebraic expression for "A number multiplied by three" is:

$3x$

This expression signifies that the number $x$ is being multiplied by 3, which means if we know the value of $x$, we can easily compute the result of $3x$. Therefore, $3x$ effectively represents any number that you choose multiplied by three, adhering to the standard conventions in algebra.