Adding and Subtracting Integers

Vocab

100

Absolute Value

The distance of a number from zero

200

Integer

The set of whole numbers and their opposites.

300

Opposite

The opposite of a number is the same distance from zero as the original number just on the other side.

400

|-6|

Absolute value of -6 = 6

500

6 and -6

Opposites

Adding Integers

100

-5 + 9

4

200

-12 + 5

-7

300

-16 + (-17)

-33

400

How do you find the sum of numbers with different signs

Subtract and take the sign of the bigger number

500

-16+18+-17

-15

Subtracting Integers

100

-4 - 6

-10

200

4 - 11

-7

300

15 - (-7)

22

400

-27 - (-3)

-24

500

-10 - 11 - (-3)

-18

Mix

100

-2 - 3

-5

200

-10 + 30

20

300

21 - (+5)

16

400

Subtracting a negative is the same thing as...

Adding a positive

500

-10 + (-2) - 5

-17

Review

100

What is 25% as a decimal and a fraction in simplest form?

.25, 1/4

200

A family wants to leave a 20% tip.  The bill was $75.42.  What is the amount of tip they will leave?

15.08

300

You got 15 out of 40 problems correct on a test.  What percent did you get?

38%

400

What is the probability of drawing a heart from a standard deck of cards?

13/52 or 1/4

500

Samuel used 1/5 of an ounce of butter to make 1/15 pound of jelly.  How many ounces of butter are needed to make a pound of jelly?

3