Adding integers

1
Adding integers

• Unit 2 Lesson 1
• PS 12-2

2
Left Side of INB

• Title and Power Standard

Do Now
Homework
If HW needs more room, turn the page and continue
on the next left side.
3
Right Side of INB
Title UL Date
Cornell Notes!
4
Do Now

• 5 9
• 9 - 5
• 1/2 3/4
• 5 - 9

5
Adding Integers

• Power Standard 12
• Fluently and accurately add, subtract, multiply,
  and divide rational numbers
• Learning Target 2
• Accurately add/subtract integers

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Definitions

• (Right Side INB)
• Absolute Value- The distance of a number from
  zero on a number line
• Integers- The set of whole numbers and their
  opposites

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Adding Integers with a Number Line

• Numbers to the RIGHT of zero are POSITIVE
• Numbers to the LEFT of zero are NEGATIVE
• Start with an open circle on the first number
• Move in the direction of the second number

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Try Some use a number line

• 9 (- 4)
• -7 3
• 5 (-10)
• - 4 4

2 minutes
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Examples

• Same sign
• Find the sum of absolute values, use sign of
  original numbers
• (-4) (-6)
• 4 6 10
• Original signs were negative, so
• (-4) (-6) -10

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Examples

• Different signs
• Find the difference of absolute values, keep sign
  of integer with greater absolute value
• 5 (-7)
• 7 - 5 2
• (-7) has greater absolute value so
• 5 (-7) -2

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Guided Practice

• Compare. Write lt, gt, or .
• -14 9 ____ -6
• 42 (-25) ___ 20
• 14 (-14) _____ 0

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Zero Pair

• A number its opposite 0
• 4 (-4) 0
• -100 100 0
• 24 (-24) 0
• -7,000,000 7,000,000 0
• Get it?

13

• Homework
• P. 142-143 13-20, 33-35, 42-44, 48-50

Homework due Monday! (You have a sub tomorrow) ?