Bellwork Oct. 1, 2010 Add. 1. –2 + 62. –3 + (–4) 3. 7 + (–5)4. 3 + (–4) 5. –6 + (–1)6. –6 + 1 4 –7 2 –1–1 –7–7 –5 SAME SIGN=SUM DIFFERENT SIGNS=DIFFERENCE.

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Presentation transcript:

Bellwork Oct. 1, 2010 Add. 1. – –3 + (–4) (–5) (–4) 5. –6 + (–1)6. – –7 2 –1–1 –7–7 –5 SAME SIGN=SUM DIFFERENT SIGNS=DIFFERENCE

2-3 Subtracting Integers Pg. 88

Essential Question  How do you subtract a negative integer?

A submarine is 58 feet below sea level. An airplane is 264 above sea level. How far above the submarine is the airplane?

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 A music recording company made a net profit of $20,000 in 2009 and had a net loss of $12,000 in How much did the company’s profits change from ?

Subtracting Integers Video Clip  Write down 3 facts about subtracting integers

Practice with the Professor  dia/homework_help/msm2/msm2_ch 02_03_homeworkhelp.html

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Same- Change- Change -3 – 2 = Same Change - 5

= -7 Same Change EXAMPLE:

Find each difference. Example 1 A. 5 – (–2) B. –3 – 7 –3 + (–7) –10 C. – 1 – (–8) –

Find each difference. A. 4 – (–2) 2 B. –2 – (–6) – C. –1 – 4 –1 + (–4) –5 Example 2

Practice

Think: 10 – 6 = 4 Largest #: 10 Sign: - Answer: Think: 8-3 = 5 Largest #: 8 Sign: + Answer: 5

Integer War  Take out the face cards  Red is negative  Black is positive  Divide the stack of cards in half  Each person flip over a card at the same time  Decide which person will be the first number in the subtraction problem.  Find the difference of the cards.  Write down each problem and answer on your paper.  Whoever answers first gets the cards  Keep track of your points