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- Integers are the set of positive and negative numbers and zero.
- Integers is nothing but a whole number with negative numbers.
- Usually for better understanding integers are represented in a number line.
- Negative numbers will be on the left side of the number line, and positive numbers will be on the right side of the number line.

Example:

The examples of negative integers are \(-1\), \(-2\), \(-2199\).

The examples of positive integers are \(1\), \(38\), \(48\), \(122\).

The number \(0\) is neither negative nor positive.

Negative numbers are always lesser than zero and positive numbers.

$\begin{array}{l}1)\phantom{\rule{0.147em}{0ex}}-3<0\\ 2)\phantom{\rule{0.147em}{0ex}}-311<0\\ 3)\phantom{\rule{0.147em}{0ex}}210>-51000\\ 4)\phantom{\rule{0.147em}{0ex}}-200<500\end{array}$

**Reflection of a number:**

Reflection of a number will have the same absolute value as that number but with a different sign.

Reflection of a number will be \(=-(\)absolute value of the number\()\)

Example:

Reflection of \(-1\) is \(-(-1) = +1\)

Reflection of \(20\) is \(-20\)

The distance between the positive number and zero in a number line will be equal to the distance between the reflection of the same negative number and zero.

Distance between \((-x)\) and \(0\) in number line \(=\) Distance between \(x\) and \(0\) in a number line.

Example:

Let us take a number \(+1\) its distance in the number line from \(0\) is \(1\).

Reflection of \(+1\) will be \(-(1)\) and its distance in the number line from \(0\) is also \(1\).

Distance between \(-20\) and \(0\) is \(20 =\) Distance between \(20\) and \(0\).

Important!

Numbers with decimals (\(0.21\), \(2.35\)), irrational numbers \(π≈3.14\), square roots - \(\sqrt{2}\), \(\sqrt{3}\) are not integers.