# Negative numbers in JavaScript

Numbers can be negative. To do this, put a minus sign before the number:

`let a = -1; alert(a); // shows -1`

A minus sign can be written to both numbers and variables:

`let a = 1; let b = -a; // the contents of a with the opposite sign is written to b alert(b); // shows -1`

Or like this:

`let a = 1; alert(-a); // shows -1`

Create the variable `a` with the value `-100`. Display this value on the screen.

Create the variable `a`, write some positive or negative number to it. Display this value with the opposite sign on the screen.

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