Multiplying and dividing negative numbers | Pre-Algebra | Khan Academy

Multiplying and dividing negative numbers
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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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1:46

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me

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Math made easy and fun! In the video the instructor says, "you can't divide any number by zero; that's undefined." I recall learning that a positive #/0 = + infinity and that a neg #/0 = - infinity. Am I wrong?

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