Wikijunior:Introduction to Mathematics/Negative Numbers

~ a positive number

~ a negative number

Subtracting Rules

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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 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.

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

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

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

${\displaystyle 7-3=4}$, ${\displaystyle 9-2=7}$, ${\displaystyle 10-5=5}$, ${\displaystyle 8-3=5}$