(Clickers & computer – Online Book)

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Presentation transcript:

(Clickers & computer – Online Book) 1.4 Multiplying Integers (Clickers & computer – Online Book)

What is multiplication? Repeated Addition For Example… 3 • 2 means to add 3 groups of 2 2 + 2 + 2 6 Use the Interactive Math Tool to demonstrate on a number line.

Rule #1 for Multiplying Integers If the signs of two integers are the same (both positive or both negative) The answer is always positive For Example… –2 • (–8) 16

Simplify 5 • 8 40 –3 • (–11) 33 Try it!

Rule #2 for Multiplying Integers If the signs of two integers are different (one positive and one negative) The answer is always negative For Example… –2 • 8 – 16

Simplify 5 • (–4) –20 8 • (–12) –96 Try it!

Simplify –5 • 6 • (–2) –30 • (–2) 60 Try it!

Simplify –2 • (–7) • (–5) 10 • (–7) –70 Try it!

Simplify (–7)2 (–7)•(–7) 49 Try it!

Simplify –82 –(8 • 8) –64 Try it!

Simplify (–2)4 (–2)•(–2)•(–2)•(–2) 4•(–2)•(–2) (–8)•(–2) 16 Try it!

Simplify (–3)2 + 12 • 4 (–3)(–3) + 12 • 4 + 9 48 57 Try it!

Simplify –62 • 2 + 5 • 2 + 5 –(6 • 6) • 2 + 5 –36 –72 + 5 –67 Try it!

Evaluate a2 – 2a + 7 for a = –4 (–4)2 – 2(–4) + 7 16 – 2(–4) + 7 16 – + 7 (–8) 16 + 8 + 7 31 Try it!

Evaluate |ab – 5b| for a = –3 and b = 6 |–3 • 6 – 5 • 6| |–18 – 30| + (–30)| |–48| 48 Try it!

Sample Application Problem (Please refer to Textbook Example 4 on p.25)

Homework p.26 1,3,7,8-44 even, 47,48,51 (MC #10,11,12)