Page 33 - Math Course 1 (Book 1)

Multiplying Integers

MO. 1 - L5b
Multiply Integers Your Turn!

Simplify Algebraic Expressions

Simplify and Evaluate Algebraic
Let’s Begin Expressions

Simplify –6(2c).

Simplify and Evaluate Algebraic A. 12c
B. –12c
Expressions C. 8c

D. –8c
Examples

Simplify 8a(–5b).

8a(–5b) = (8)(a)(–5)(b) Answer

= (8 –5)(a b) Commutative Property
of Multiplication
Simplify 5m(–7n)
= –40ab (8 –5) = –40, a b = ab A. –2mn
B. –12mn
Answer –40ab C. 35mn
D. –35mn

Evaluate –3xy if x = –4 and y = 9.

–3xy = –3(–4)(9) Replace x with –4 and Answer
y with 9.

= [–3(–4)](9) Associative Property of Evaluate –9ab if a = –3 and b = –6.
Multiplication.
A. 81
= 12(9) The product of –3 and –4 is B. 162
positive. C. –162
D. –81
= 108 The product of 12 and 9 is
positive.

Answer 108
Answer

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