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Add and Subtracting Positive Numbers

Positive Number- A number greater than zero

0 1 2 3 4 5

Negative Numbers- A number that is less than zero

-5 -4 -3 -2 -1 0

Absolute Value- The distance of a number from 0 on a number line

-5 -4 -3 -2 -1 0 1 2 3 4

|3| = 3|-1|= 1|-5| = 5

Opposite Numbers- Numbers whose values add up to 0

-5 -4 -3 -2 -1 0 1 2 3 4

Integers- Integers are all of the whole numbers and all

of their opposites on a number line including 0

Definition

Hint

If you do not see a sign attached to a number, the number is positive

Ex: 9 = +9

Addition of Integers Rule #1

If the signs are the same, pretend the signs aren’t there. Add the numbers and then put the sign in front of your answer.

Solve

-3 + -5 =

6 + 9 =

(+4) + (+3) =

-6 + -10 =

-14 + - 12 =

Addition of Integers Rule #2

If the signs are different, pretend the signs aren’t there. Subtract the larger number from the smaller number and then put the sign of the larger number in front of your answer.

Solve

-5 + 2 =

8 + -4 =

-6 + 10 =

14 + -10 =

7 + -3 =

8 + - 12 =

-15 + 4 =

Using A Number Line

-5 -4 -3 -2 -1 0 1 2 3 4

-3 + 5

Subtracting Negative Numbers

When you subtract a negative number it is simply the same as adding a positive number.

Ex: - 5 - -4 = -5 + 4 = -1

5 - -7 = 12

Solve

-4 - -5 =

-8 - -1 =

7 - -12 =

-10 - -5 =

12 - -4 =

-2 - -5 =