Numbers/Content/Using Numbers/Using Negative Numbers

< Using Numbers

Lesson

Adding and Subtracting

~ a positive number

~ a negative number

Adding Rules

Subtracting Rules

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

$7+-4=7-4$

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

$7--4=7+4$

Multiplying and Dividing

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

$-2*3=-6$

$2*-3=-6$

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

$-2*-3=6$

Do the same for dividing.

$-6$ ÷ $3=-2$

$6$ ÷ $-3=-2$

$-6$ ÷ $-3=2$