On Desk: 1.Pencil 2.Math Journal 3.Learning Log Learning Log: HW: WS -Adding & Subtracting...

On Desk:1. Pencil2. Math Journal3. Learning Log

Learning Log:• HW: WS -Adding & Subtracting

Integers (D)• Parent Sig. on SD – Log• Unit Test returned after

retake?• *Partner Quiz – Mon. 10/5

Math CC7/8 – Be Prepared

• AN -Lesson 2.3• Learning Check – AN Inv. 1-2• Begin HW?

Tasks for Today

-3 +3

Skip?

+3 -3

Skip?

Any addition expression can be rewritten as subtraction by subtracting the opposite of the number being added.

Skip?

Any subtraction expression can be rewritten as addition by adding the opposite of the number being subtracted.

Adding Integers

Remember the rules?Positive + Positive =Negative + Negative =

Positive + Negative =Negative + Positive =

PositiveNegative

1. Find the difference between the two numbers.

2. Take the sign of the number with the greater absolute value.

Subtracting Integers

Subtracting an integer is the same as:Adding its opposite

Therefore,Subtracting a positive is the same as:

Adding a negativeSubtracting a negative is the same as:

Adding a positive

Then, just use the addition rules to solve!

Learning Check – AN Inv. 1-2

Use your algorithms to find each sum or difference without using a calculator.

1) +12 - +3=

2) -75 + -30=

3) +45 - -60=

4) -9 - -9=

5) -25 - +15=

6) +11 + -5=