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Key Concepts

• Opposite Notation
  • [latex]-a[/latex] means the opposite of the number [latex]a[/latex]
  • The notation [latex]-a[/latex] is read the opposite of [latex]a[/latex].
• Absolute Value Notation
  • The absolute value of a number [latex]n[/latex] is written as [latex]|n|[/latex] .
  • [latex]|n|\ge 0[/latex] for all numbers.

Glossary

absolute value

The absolute value of a number is its distance from 0 on the number line.

integers

Integers are counting numbers, their opposites, and zero … [latex]–3, –2, –1, 0, 1, 2, 3\dots[/latex]

negative number

A negative number is less than zero.

opposites

The opposite of a number is the number that is the same distance from zero on the number line, but on the opposite side of zero.