Multiplying and Dividing Integers 1.3 & 1.4 Multiplying and Dividing Integers Course 2 Multiplying and Dividing Integers!

I can multiply and divide integers! Course 2 Multiplying and Dividing Integers 1.3 & 1.4 I can multiply and divide integers!

Review -4 + 5 -6 + -2 12 + (-15) 3 – (-3) (-6) – 7 (-4) – (-9) 1 -8 -3 3 + 3 = 6 -6 + -7 = -13 -4 + 9 = 5

Let’s think about what happens when we multiply negative numbers… Course 2 Multiplying & Dividing Integers 1.3 & 1.4 Let’s think about what happens when we multiply negative numbers… Can you see a pattern or rule? Discuss with your partner your observations. 1. 5 x (-3) = -15 2. 1 x (-4) = -4 3. (-3) X 7 = -21 4. (-2) x 8 = -16 5. (-5) x (-4) = 20 6. (-1) x (-6) = 6 7. (-7) x (-5) = 35 8. (-3) x (-9) = 27 4

What about when we divide negative numbers? Course 2 Multiplying & Dividing Integers 1.3 & 1.4 What about when we divide negative numbers? Can you see a pattern or rule? Discuss with your partner your observations. 1. 15 ÷ (-3) = -5 2. 16 ÷ (-4) = -4 3. (-21) ÷ 7 = -3 4. (-64) ÷ 8 = -8 5. (-25) ÷ (-5) = 5 6. (-6) ÷ (-6) = 1 7. (-40) ÷ (-5) = 8 8. (-63) ÷ (-9) = 7 5

Multiplying and Dividing Integers Course 2 Multiplying and Dividing Integers 1.3 & 1.4 So When X/÷ Integers: Do the math as you would normally, then check the signs: *If the signs are the same your answer is positive. Example: -3 x -2 = 6 *If the signs are different your answer is negative: Example: -3 x 2 = -6

Multiplying and Dividing Integers Insert Lesson Title Here Course 2 Multiplying and Dividing Integers Insert Lesson Title Here 1.3 & 1.4 Let’s Practice Find each product or quotient. 1. –8 · 2 2. –3 · 5 · (–2) 3. –75 ÷ 5 4. –110 ÷ (–2) –16 30 –15 55

Multiplying and Dividing Integers Course 2 2-4 Multiplying and Dividing Integers Let’s Practice Find each product. A. –6 · (–5) –6 · (–5) Both signs are negative, so the product is positive. 30 B. –4 · 7 –4 · 7 The signs are different, so the product is negative. -28

Multiplying and Dividing Integers Course 2 2-4 Multiplying and Dividing Integers Now Try Dividing… Find each quotient. A. 35 ÷ (–5) 35 ÷ (-5) Think: 35 ÷ 5 = 7. –7 The signs are different, so the quotient is negative. B. –32 ÷ (–8) -32 ÷ (–8) Think: 32 ÷ 8 = 4. The signs are the same, so the quotient is positive. 4

Multiplying and Dividing Integers Insert Lesson Title Here Course 2 2-4 Multiplying and Dividing Integers Insert Lesson Title Here What about this one? 5. The temperature at Bar Harbor, Maine, was –3°F. It then dropped during the night to be 4 times as cold. What was the temperature then? –12°F