# Basic Operations

There are four basic operations :

$+$ (addition) . . . . . . . . . . . . .as in $6+2=8$ ; the sum of $6$ and $2$ is $8$ .

$-$ (subtraction) . . . . . . . . . . .as in $6-2=4$ ; the difference of $6$ and $2$ is $4$ .

$×$ or $\cdot$ or $\ast$ (multiplication) . as in $6\ast 2=12$ ; the product of $6$ and $2$ is $12$ .

$/$ or $÷$ (division) . . . . . . . . . as in $6/2=3$ ; the quotient of $6$ and $2$ is $3$ .

You use parentheses $\left(\right)$ for grouping and sometimes multiplication.

Examples:

$20-12-7=8-7=1$ , while

$20-\left(12-7\right)=20-5=15$

Also, $\left(3+4\right)\left(6-2\right)$

$\begin{array}{l}=\left(7\right)\left(4\right)\\ =7×4\\ =28,\end{array}$

while

$\begin{array}{l}3+\left(4\right)\left(6\right)-2\\ =3+24-2\\ =27-2\\ =25.\end{array}$