Adding and Subtracting Integers

Vocab

100

Rational Number

A number that can be written as a fraction.

200

Integer

The set of whole numbers and their opposites.

300

Opposite

same number but different sign.

400

What do we call numbers such as 1, 2, 3, ...?

Counting/Natural Numbers

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

Challenge

100

1/2 + 1/4

3/4

200

-2/3 + 1/3

-1/3

300

5/6 + 2/3

9/6 or 1 1/2 or 1.5

400

1.65 + (-1.2)

0.45

500

-1/9 - 1/2

-11/18