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1.4 Sums & Differences & 1.5 Products

1.4 Sums & Differences & 1.5 Products. Today’s Date: 9/2/11. 1.4 Sums & Differences. Rules for Addition Same sign: Diff signs: Ex 1). keep the sign & add abs. value of #s. keep sign of ‘larger’ # & subtract #s. ‘bigger’ – ‘smaller’. –14 + 9 + (–12) + 20 + (–8). Left to Right.

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1.4 Sums & Differences & 1.5 Products

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  1. 1.4 Sums & Differences & 1.5 Products Today’s Date: 9/2/11

  2. 1.4 Sums & Differences Rules for Addition Same sign: Diff signs: Ex 1) keep the sign & add abs. value of #s keep sign of ‘larger’ # & subtract #s ‘bigger’ – ‘smaller’ –14 + 9 + (–12) + 20 + (–8) Left to Right –5 + (–12) + 20 + (–8) –17 + 20 + (–8) 3 + (–8) –5

  3. Definition of Subtraction add its opposite a – b = a + (–b) Ex 2) –7 – (–8) –7 – 8 –7 + 8 –7 + (–8) 1 –15 7 – (–8) 7 – 8 7 + (–8) 7 + 8 –1 15

  4. T.O.O. (Try On Own) Ex 4) Ex 3) Why negative?

  5. 1.5 Products Rules for Multiplication: same sign: diff signs: Ex 5) (4)(2) (+) answer (–) answer = 8 (–4)(–2) = 8 (–4)(2) (4)(–2) = –8 = –8 Ex 6) (–3)(–2)(–1)(4)(–5) TOO Odd # of (–) signs = (–) answer Even # of (–) signs = (+) answer (6)(–1)(4)(–5) (–6)(–20) = 120

  6. Give the OPPOSITE of: Ex 7) 3y + 5 OPP: –(3y + 5) –3y – 5 Ex 8) Give the opposite of: –xy – 5z TOO –(–xy – 5z) –(–xy) + –(–5z) xy + 5z

  7. Homework #103 Pg. 24 1 – 33 EOO Pg. 30 1 – 33 EOO EOO: 1, 5, 9, 13, 17, 21, 25, 29, 33 TB Cover Quiz on Wed 9/7!

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