Adding And Subtracting Negative Numbers | Pre-Algebra | Khan Academy


Learn how to add and subtract negative numbers. The problems solved in this video are 2 – 3 = -1 and -2 – 3 = -5 and -2 + 3 = 1 and 2 – (-3) = 5 and -2 – (-3).

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Pre-Algebra on Khan Academy: No way, this isn’t your run of the mill arithmetic. This is Pre-algebra. You’re about to play with the professionals. Think of pre-algebra as a runway. You’re the airplane and algebra is your sunny vacation destination. Without the runway you’re not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We’re about to take off!

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13 thoughts

  1. Why on earth have you come up with this way of doing math when the old way has been fine for over 200 years.
    I think this is totally UNACCEPTABLE.
    How in the world do you figure Two negatives make a positve. Oh let me see them one sideways and put them together and now you have a positive. And when In life WILL anyone ever have to use this way of math? This is what they call common core?
    It is ridiculous. It is so confusing. No wonder KIDS are failing. It’s pathetic.

  2. All my math teacher does is talk about his life and how is such a ” great” teacher when he is like 78 years old

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