Wikijunior:Introduction to Mathematics/Negative Numbers

Lesson

~ a positive number

~ a negative number

 - = - = - = - = - = - =

Adding a negative number is the same as subtracting a positive number.

${\displaystyle 7+-4=7-4}$

Subtracting a negative number is the same as adding a positive number.

${\displaystyle 7--4=7+4}$

Multiplying and Dividing

Multiplying a negative number by a positive number, or a positive number by a negative number makes the answer negative.

${\displaystyle -2\times 3=-6}$
${\displaystyle 2\times -3=-6}$

Multiplying a negative number by a negative number makes the answer positive.

${\displaystyle -2\times -3=6}$

Do the same for dividing.

${\displaystyle -6\div 3=-2}$
${\displaystyle 6\div -3=-2}$
${\displaystyle -6\div -3=2}$