# End of textbook section. You should now be prepared to do assignment 1.1

## 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.