Opposite numbers — lesson. Mathematics CBSE, Class 7.

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Opposite numbers are two numbers whose distance from the origin of the coordinate axis (to zero) is the same but differ by a sign.

Numbers

$1$ and

$-1$ are opposite numbers because they are equidistant from zero (one box or one unit).
These numbers differ by a sign, with only one number to the right of zero (

$1$ ) and the other to the left of zero (

$-1$ ).

The opposite numbers for

$-2$ is

$2$ ;

$-3$ is

$3$ ;

$-4$ is

$4$ and so on.

The number opposite to zero is zero.

Do not confuse opposite numbers with inverse numbers.

The inverse of a number is called a fraction.

The inverse of

$\frac{a}{b}$ is

$\frac{b}{a}$ .

Example:

The inverse of number

$\frac{2}{3}$ is

$\frac{3}{2}$ .

You can also determine the inverse of a negative number:

$The inverse part of - \frac{31}{10} is - \frac{10}{31}$

To get an inverse number, swap the denominator of the part with the numerator, the sign remains the same.

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3. Opposite numbers

Theory: