Negative number

A negative number is a number whose value is always less than zero and it has a minus (-) sign before it. On a number line, negative numbers are represented on the left side of zero.

They can be integers, decimals, or fractions.

For example: -7, -24, -3/5, -0.8 are termed as negative numbers. 

Here is a tutorial video: https://www.youtube.com/watch?v=OAoLCXpao6s

Here are some games: https://www.mangahigh.com/en/games/minusminers