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Pre-Algebra Numbers and operations

Integers

20 practice questions 0 video lessons Theory + worked examples

Integers

Texas Pre-Algebra (TEKS) • Standard 6.2(C) • Numbers & Operations

Integers is the opening topic of Numbers & Operations in the Texas Essential Knowledge and Skills. It is aligned to Standard 6.2(C), which requires students to understand positive and negative integers, order them, and describe opposites on a number line.

The integers are the whole numbers, their opposites, and zero, ordered on a number line with negatives to the left of \(0\).

Texas Pre-Algebra (TEKS) › Numbers & Operations › Integers  —  Standard 6.2(C)

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Theory

The integers are the counting numbers, their opposites, and zero: \(\ldots,-3,-2,-1,0,1,2,3,\ldots\).

On a number line, numbers increase to the right; every integer has an opposite the same distance from \(0\).
Integers on a number line Integers are the whole numbers and their opposites, placed on a number line. -5 -4 -3 -2 -1 0 1 2 3 4 5 -3 0 4
Integers on a number line.
Integers Integers Integers ... -3, -2, -1, 0, 1, 2, 3 ... negatives left of 0, positives right 0 is neither positive nor negative
What the integers are.

Ordering:

\[a>b \iff a \text{ lies to the right of } b\]
a is greater than b when a is to the right of b on the number line
The opposite of \(a\) is \(-a\).

How to compare integers

  1. Place both on a number line.
  2. The one farther right is greater.
  3. Negatives get smaller as you move left.
  4. The opposite flips the sign.
Example 1 β€” Compare
Which is greater, \(-3\) or \(-7\)?
Solution

Farther right on the number line is greater.

\(-3\)\(>\)\(-7\)
negative 3 is greater
Example 2 β€” Opposite
What is the opposite of \(6\)?
Solution

The opposite is the same distance from \(0\) on the other side.

\(-(6)\)\(=\)\(-6\)
negative 6
Example 3 β€” Order
Order \(-2,\ 3,\ -5,\ 0\) from least to greatest.
Solution

Read left to right on the number line.

\(-5,\ -2,\ 0,\ 3\)
negative 5, negative 2, 0, 3
Example 4 β€” Real context
A temperature of \(-8^\circ\) rises to \(-3^\circ\). Did it warm or cool?
Solution

\(-3\) is greater than \(-8\), so it warmed.

it warmed

Common pitfalls

\(-7<-3\): a bigger digit can mean a smaller negative.
Zero is an integer, neither positive nor negative.
The opposite of \(0\) is \(0\).

Frequently asked questions

What are integers?

The whole numbers and their opposites, including zero.

Is zero an integer?

Yes, and it is neither positive nor negative.

Which is greater, two negatives?

The one closer to zero (farther right).

What is an opposite?

The number the same distance from zero on the other side.