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Published byZoe Hawkins Modified over 9 years ago
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Positive and Negative Numbers by Mr. Russo
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We know when we see positive numbers, but when do we use or see negative numbers?
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Negative Numbers Are Used to Measure Temperature
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Negative Numbers Are Used to Measure Under Sea Level 0 10 20 30 -10 -20 -30 -40 -50
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Negative Numbers Are Used to Show Debt Let’s say you wanted your parents to buy you a video game. They loaned you $50. You buy your game and enjoy it. However, you still owe Mom & Dad $50. Your current balance or debt is -$50.
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Definition Positive number – a number greater than zero. 0123456
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Definition Negative number – a number less than zero. 0123456-2-3-4-5-6
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Definition Opposite Numbers – numbers that are the same distance from zero in the opposite direction 0123456-2-3-4-5-6
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Positive & Negative Numbers Working with positive and negative numbers is like driving in traffic. You have to watch the traffic signs and follow the driving rules.
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Solve the Problems -3 + -5 = 4 + 7 = (+3) + (+4) = -6 + -7 = 5 + 9 = -9 + -9 = -8 -18 14 -13 7 11
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Addition Rules Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers together and re-attach the sign you started with. 9 + 5 = 14 -9 + -5 = -14
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Solve the Problems 3 + -5 = -4 + 7 = (3) + (-4) = -6 + 7 = 5 + -9 = -9 + 9 = -2 0 -4 1 3
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Integer Addition Rules Rule #2 – If the signs are different, subtract the two numbers and take the sign of the larger number. -9 + 5 = 9 - 5 = 4 Larger number Answer = - 4
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Independent Practice Math Journal p. 232-233 Once finished, you can try the Math challenge games on Mr. Russo's WebsiteMr. Russo's Website
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