Adding integers review web
Transcript of Adding integers review web
Adding Integers Review
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.
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
Where we were…• Adding integers
o Same signs…o Opposite signs…
• Subtracting Integerso Additive inverse
• Absolute value
Where we are…• Students will learn to…
o Review the rules for adding integers.
Homework
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
Where we are going…• Quiz on Friday
o Adding integers
o Subtracting integers
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…
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.
-10 + (-20)• How do you know?
-10 + (-20)• How do you know?• - 30; add and keep the common sign
-20 + (-10)• What property allows you to switch the order of
addition?
-20 + (-10)• What property allows you to switch the order of
addition?• - 30; commutative property
- ½ + (- ½ )
- ½ + (- ½ )• - 1
15 + (-9)
15 + (-9)• 6
-13 + 20
-13 + 20• 7
-7 + ___ = 0• What is this called?
-7 + ___ = 0• What is this called?
• 7; zero pairs, additive inverse, opposites
-9 + 9 + (-14)
-9 + 9 + (-14)• -14
Algebra• The sum of a number and -20 = 40. What is the
number?
Algebra• The sum of a number and -20 = 40. What is the
number?• 60 + (-20) = 40
x + yWhen: x = 5, y = -1
x + yWhen: x = 5, y = -1
5 + (-1) = 4
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?
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.
Homework• Adding integers review worksheet
• Due tomorrow.