Subtracting Integers

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Subtracting Integers

• Created by
• Leslie Lause
• Owensville Middle School
• 7th grade Mathematics

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Objective

• MA-NO-2-B-07
• The student will be able to solve integers using
  subtraction. Then be able to describe the
  effects of subtraction on integers.

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Leave, Change, Make opposite

• Leave the first value alone
• Change the subtraction to addition
• Make the second value its opposite.
• Solve using rules of adding integers.
• -2 3
• Leave Change Make opposite Solve
• -2 -3

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Review Adding integers

• Adding same signs
• Add the absolute value
• Take the sign of both
• Example
• -4 -7
• -1 -2
• 5 2

• Adding different signs
• Subtract the absolute values
• Take sign of the largest absolute value.
• Example
• -1 5
• 3-2
• -42

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Examples

• -3 4
• 4 - -2
• -6 2

• 3 - -1
• -7 8
• -5 - -4

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Traveling the number line

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On-line Practice
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Practice

• The difference of integers side of the worksheet
  we graded yesterday.

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Citations

• http//nlvm.usu.edu/en/nav/frames_asid_162_g_3_t_1
  .html
• http//www.mathwizz.com/integers/page3.htm