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Multiply & Divide with Negative Numbers
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What you will learn from this videoWhat you will learn
- How to multiply with negative numbers.
- How to divide with negative numbers.
- We’ll see how this knowledge can help us track weather, learn about the stock market, and even start a business!
- Discussion Questions
Before Video
What is (−3) + (−3) + (−3)?ANSWER−9.
3 × (−3).
A negative number.
A positive number.
The negative number that is closer to zero or to the right is greater.
After Video
Two integers are multiplied, and their product is negative. What must be true about the numbers?ANSWEROne number must be positive and the other must be negative.
The numbers (dividend and divisor) both have the same sign.
The sign of the product and of the quotient follow the same rules in relation to the sign of the two numbers being multiplied or divided. If the numbers have the same sign, the product or quotient is positive. If they have different signs, the product or quotient is negative.
The product is negative since there is an odd number of negative factors. Each pair of negative factors results in a positive product, which is then multiplied by a negative number.
Answers will vary. 50 ÷(-10)=-5
- Vocabulary
- Integer DEFINE
The set of whole numbers and negative whole numbers.
- Whole Number DEFINE
The set of counting numbers and zero.
- Absolute Value DEFINE
The distance of a number from 0 on the number line.
- Factor DEFINE
A number being multiplied in a multiplication problem.
- Product DEFINE
The result of multiplying.
- Dividend DEFINE
The number being divided in a division problem.
- Divisor DEFINE
The dividing number in a division problem.
- Quotient DEFINE
The result of dividing.
- Positive Number DEFINE
A number to the right of zero on the number line.
- Negative Number DEFINE
A number to the left of zero on the number line.
- Opposites DEFINE
A number that is the same distance from zero, but on the other side of zero on the number line.
- Integer DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide
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