-5 is the mathematical expression of the given statement.
What is number?
An arithmetic value used to represent a quantity is called a number. A number is a mathematical concept that is used for counting, measuring, and labeling.
We are looking for a new number which is 10 less than 5.
We will get the new number by subtracting 10 from 5.
∴5-10=-5
As a result, -5 is the correct answer.
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