Multiply Integers with Different Signs A. Find 8(–9). 8(–9) = –72The factors have different signs. The product is negative. Answer: –72.

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Presentation transcript:

Multiply Integers with Different Signs A. Find 8(–9). 8(–9) = –72The factors have different signs. The product is negative. Answer: –72

Multiply Integers with Different Signs B. Find –9(11). Answer: –99 –9(11) = –99The factors have different signs. The product is negative.

A.–3 B.–46 C.48 D.–48 A. Find –4(12).

A.12 B.–12 C.–3 D.–8 B. Find 6(–2).

Multiply Integers with the Same Sign A. Find –4(–16). Answer: 64 –4(–16) = 64The factors have the same sign. The product is positive.

Multiply Integers with the Same Sign B. Find –9(–3)(–2). Answer: –54 –9(–3)(–2) = [(–9)(–3)](–2)Associative Property = (27)(–2)(–9)(–3) = 27 = –54(27)(–2) = –54

A.24 B.–24 C.–11 D.23 A. Find –3(–8).

A.0 B.–81 C.308 D.–308 B. Find –7(11)(–4).

A student missed only 4 problems on a test, each worth 20 points. What integer represents the total number of points earned for those questions? A –5 B –20 C 24 D –80 Read the Test Item The word missed means losing points, so the loss per problem is –20. Multiply 4 times –20 to find the total number of points lost. 4(–20) = –80The product is negative. Answer: The answer is D. Solve the Test Item

Answer: The answer is D.

A.–3 B.6 C.–9 D.9 FOOTBALL A football team loses 3 yards on each of 3 consecutive plays. Find the total yards lost.

A. Simplify 8a(–5b). Answer: –40ab Simplify and Evaluate Algebraic Expressions 8a(–5b)=(8)(a)(–5)(b) =(8 ● –5)(a ● b)Commutative Property of Multiplication =–40ab(8 ● –5) = –40, a ● b = ab

B. Evaluate –3xy if x = –4 and y = 9. Answer: 108 Simplify and Evaluate Algebraic Expressions –3xy=–3(–4)(9)Replace x with –4 and y with 9. =[–3(–4)](9)Associative Property of Multiplication =12(9)The product of –3 and –4 is positive. =108The product of 12 and 9 is positive.

A.12c B.–12c C.8c D.–8c A. Simplify –6(2c).

A.–2mn B.–12mn C.35mn D.–35mn B. Simplify 5m(–7n).

A.81 B.162 C.–162 D.–81 C. Evaluate –9ab if a = –3 and b = –6.