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