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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

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+3 -3

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

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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=