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Multiplying and dividing negative numbers

6 videos
3 skills
Hopefully you agree that negative numbers aren't so "negative" after all. They're actually very useful and kind fun to play around with! In this section we want to give you a better conceptual understanding of why the products of negative numbers are defined as they are. We also want build on our knowledge and examine multiplying and dividing negative and positive numbers. Common Core Standards: 7.NS.A.2a, 7.NS.A.2b

Multiplying positive and negative numbers

VIDEO 5:34 minutes
Here we explain some rules of thumb regarding the multiplication of positive and negative numbers.

Why a negative times a negative is a positive

VIDEO 5:47 minutes
Why are the products of negative numbers defined in the way they are? We'll use the distributive property to help you with your understanding.

Why a negative times a negative makes intuitive sense

VIDEO 6:14 minutes
We use the repeated addition model of multiplication to give an intuitive understanding of multiplying negative numbers.

Dividing positive and negative numbers

VIDEO 4:52 minutes
In this video we take you through the basics of dividing with negative numbers. You'll need to draw from your multiplication skills, too.

Rules for multiplying and dividing negative numbers

PRACTICE PROBLEMS
Decide whether the result of an operation will be positive or negative.

Dividing by zero

PRACTICE PROBLEMS

Multiplying numbers with different signs

VIDEO 2:26 minutes
Help us find the product of numbers with different signs.

Multiplying and dividing negative numbers

PRACTICE PROBLEMS
Multiply or divide positive and negative integers. No remainder.

Why dividing by zero is undefined

VIDEO 4:08 minutes
Thinking about why dividing by zero is left undefined