Adding integers review web
Transcript of Adding integers review web
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Adding Integers Review
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Bell Ringer• A positive + a positive is (always, sometimes,
never) a positive.
• A positive + a positive is (always, sometimes, never) a negative.
• A negative + a negative is (always, sometimes, never) negative.
• A positive + a negative is (always, sometimes, never) a positive.
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Bell Ringer• A positive + a positive is (always, sometimes,
never) a positive.o POSITIVE
• A positive + a positive is (always, sometimes, never) a negative.o NEVER
• A negative + a negative is (always, sometimes, never) negative.o ALWAYS
• A positive + a negative is (always, sometimes, never) a positive.o SOMETIMES
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Where we were…• Adding integers
o Same signs…o Opposite signs…
• Subtracting Integerso Additive inverse
• Absolute value
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Where we are…• Students will learn to…
o Review the rules for adding integers.
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Homework
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Unit Plan• I can… represent addition and subtraction on a
horizontal number or vertical number line.o Rate yourself and date
• I can… solve real-world and mathematical problems involving the four operations with rational numbers.o Rate yourself and date
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Where we are going…• Quiz on Friday
o Adding integers
o Subtracting integers
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Adding Integers• Power Write #1
o Describe the rules for adding integers with the same signs…
• Power Write #2
o Describe the rules for adding integers with opposite signs…
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Adding Integers• Power Write #1
o Describe the rules for adding integers with the same signs…• Add the numbers, keep the common sign
• Power Write #2
o Describe the rules for adding integers with opposite signs…• Subtract the numbers, keep the sign of the number with the larges
absolute value.
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-10 + (-20)• How do you know?
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-10 + (-20)• How do you know?• - 30; add and keep the common sign
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-20 + (-10)• What property allows you to switch the order of
addition?
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-20 + (-10)• What property allows you to switch the order of
addition?• - 30; commutative property
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- ½ + (- ½ )
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- ½ + (- ½ )• - 1
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15 + (-9)
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15 + (-9)• 6
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-13 + 20
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-13 + 20• 7
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-7 + ___ = 0• What is this called?
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-7 + ___ = 0• What is this called?
• 7; zero pairs, additive inverse, opposites
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-9 + 9 + (-14)
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-9 + 9 + (-14)• -14
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Algebra• The sum of a number and -20 = 40. What is the
number?
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Algebra• The sum of a number and -20 = 40. What is the
number?• 60 + (-20) = 40
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x + yWhen: x = 5, y = -1
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x + yWhen: x = 5, y = -1
5 + (-1) = 4
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Word Problem• A football team gained 7 yards on the first play,
lost 9 yards on the second play and gained 6 yards on the third play. To get a first down, they must gain 10 yards on 4 plays.
• Write an addition expression that shows this scenario.
• How many yards will the team need to gain on it’s fourth play to get a first down?
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Word Problem• A football team gained 7 yards on the first play,
lost 9 yards on the second play and gained 6 yards on the third play. To get a first down, they must gain 10 yards on 4 plays.
• Write an addition expression that shows this scenario. o 7 + (-9) + 6
• How many yards will the team need to gain on it’s fourth play to get a first down?o They have gained 4 yards, so they need 6 more yards for a first down.
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Homework• Adding integers review worksheet
• Due tomorrow.