Add/Subtract Positive/Negative Decimals 1

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Taught by YourMathGal
  • Currently 3.0/5 Stars.
2734 views | 1 rating
Meets NCTM Standards:
Errors in this video:

At about the 10:11 mark, the teacher says 10.945 is smaller than 8.32; she should have said that 10.945 is bigger than 8.32.

Lesson Summary:

In this lesson, Julie Harland teaches how to add and subtract decimals containing both positive and negative integers. She starts by explaining the rules for adding two negative numbers and then moves on to adding a positive and negative number. Harland emphasizes that it's important to first determine if the answer will be positive or negative based on the signs of the numbers being added or subtracted. She also demonstrates how to rewrite subtraction problems as adding the opposite and goes over the steps for finding the answer.

Lesson Description:

Shows how to add and subtract decimals when negative numbers are involved.

More free YouTube videos by Julie Harland are organized at

Questions answered by this video:
  • How do I add and subtract numbers with decimals?
  • What does -3.4+(-5.31) equal?
  • What does -14+(-5.32)+(-12.6) equal?
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  • What does -32.46+16.31 equal?
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  • What does 8.32-10.945 equal?
  • Staff Review

    • Currently 3.0/5 Stars.
    In this lesson, the teacher shows how to do addition and subtraction with positive/negative numbers that have decimals.