Math CC7/8 – Be Prepared On Desk: Learning Log:

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Presentation transcript:

Math CC7/8 – Be Prepared On Desk: Learning Log: Pencil Math Journal AN Learning Log Learning Log: HW: p. 45, #18-37, #61-62, #65-66 Parent Sig. on Test (by Wed) Parent Sig. on LL (by Wed) Retakes- Thurs., rm. 203, 2:40-3:40 PM (Mrs. Miner)

Warm Up Copy and solve the following problems in your journal: 13 + -8 = -22 + -9 = -11 + 17 = 6 + -33 =

Tasks for Today Warm Up – Adding Integers Numbers AN - Lesson 2.2 Begin HW?

PBS Math Club Video

Adding Integers Remember the rules? Positive + Positive = Negative + Negative = Positive + Negative = Negative + Positive = Positive Negative Find the difference between the two numbers. Take the sign of the number with the greater absolute value.

$40 He should use a negative sign, - $40.

“Don’t subtract… add the opposite” Same signs Different signs Change a subtraction expression to an addition by adding the opposite of the second number. “Don’t subtract… add the opposite”

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

Skip? -10 – 5 5 - -10 -10 – 5 = -15 = 15 5 - -10 = 15 = 15

No! Subtraction is NOT commutative.