Class 6 · Chapter 6

Integers

Positive and negative integers; representation on a number line; addition and subtraction of integers.

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Detailed theory

Integers:

\ldots, -3, -2, -1, 0, 1, 2, 3, \ldots

. Positive integers (

>0

), zero, and negative integers (

<0

). They represent quantities with direction (temperature above/below zero, altitude above/below sea level).

Key concepts & formulas

Integers =

\ldots, -3, -2, -1, 0, 1, 2, 3, \ldots

On a number line, positive integers lie right of

0

, negatives left.

a + (-a) = 0

;

-a

is the additive inverse of

a

Subtracting an integer is same as adding its inverse.

0

is neither positive nor negative.