Preparation for Geometry’s Journey

Tuesday, August 19

Adding and Subtracting Integers

• If the numbers have the same signs,– keep the signs and add the numbers

• If the numbers have different signs,– subtract the numbers and keep the sign

from the largest number.

7 + 2 -7 + -2 -7 – 2

7 – 2 7 + -2 -7 + 2 2 – 7

-9 + -6

A. -15

B. 15

C. -3

D. 3

-8 + 2

A. -10

B. 10

C. -6

D. 6

-1 + 3

A. -4

B. 4

C. -2

D. 2

4 + -10

A. -14

B. 14

C. -6

D. 6

14 + -9

A. -23

B. 23

C. -5

D. 5

Remember subtracting a negative

is the same as adding a positive

-9 – -6

A. -15

B. 15

C. -3

D. 3

-8 – 2

A. -10

B. 10

C. -6

D. 6

-1 – 3

A. -4

B. 4

C. -2

D. 2

4 – -10

A. -14

B. 14

C. -6

D. 6

4 – 10

A. -14

B. 14

C. -6

D. 6

-3 – -3

A. 0

B. 9

C. -6

D. 6

When adding or subtracting more than two numbers…

ALWAYS GO LEFT TO RIGHT

7 + 2 + -13

Subtract signs are attached to their number like negatives.

7 – 2 + 12 + -3

4 – 10 + 8

A. -14

B. 14

C. 2

D. 2

Adding Integers Practice

Attach worksheet into your notebook.

If it has more than 2 numbers, show what your first step is.

Multiplying & Dividing Integers

• If the signs are the same,– then the answer is positive.

• If the signs are different,– then the answer is negative.

7 x -2 -7(2) -6 ÷ 2 6/-2

7 x 2 (-7)(-2) -6/-2 6÷2

Multiplying Integers Practice

Attach worksheet into your notebook.

Probability Basics

• Top Number – number of the specific thing

• Bottom Number – total number of items

8 red dots, 11 green dots

• Probability of getting green

As a fraction

As a decimal

As a percent

8 red dots, 11 green dots

• Probability of getting red

As a fraction

As a decimal

As a percent

Probability Practice

Attach worksheet into your notebook.