Multiplying and Simplifying Fractions

This video tutorial covers the multiplication of rational numbers, including both negative numbers and fractions. It begins with basic examples of multiplying negative numbers, emphasizing the rule that two negatives make a positive. The tutorial then moves on to multiplying fractions, demonstrating how to handle negative fractions and the importance of simplification. A technique called cross division is introduced to simplify fractions before multiplication. The video concludes with additional examples and tips, highlighting the importance of organization and checking work with a calculator.

What is the result of multiplying -2 by -3.5?

• -7

• 7

• -5.5

• 5.5

Tags

CCSS.7.NS.A.2A

When multiplying -3 by -1.25, what is the correct product?

• -3.75

• -2.5

• 3.75

• 2.5

Tags

CCSS.7.NS.A.2A

What is the simplified result of multiplying 2/3 by -1/2?

• 2/3

• -2/3

• 1/3

• -1/3

Tags

CCSS.7.NS.A.2A

How do you simplify the product of -2/3, -1/2, and -3/5?

• 2/5

• -2/5

• 1/5

• -1/5

Tags

CCSS.7.NS.A.2A

What is the result of multiplying -3/4 by -4/7?

• -3/7

• -3/14

• 3/7

• 3/14

Tags

CCSS.5.NF.B.6

Which technique helps simplify fractions before multiplication?

• Cross-subtraction

• Cross-division

• Cross-multiplication

• Cross-addition

Tags

CCSS.7.NS.A.2A

What is the final simplified form of multiplying 2/3 by -9/10 by 5/6?

• -1/2

• 1/2

• 1/3

• -1/3

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

If you multiply an odd number of negative numbers, what is the sign of the result?

• Positive

• Negative

• Undefined

• Zero

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

Why is it important to show all your work when solving problems?

• To confuse others

• To avoid mistakes

• To impress the teacher

• To save time

Tags

CCSS.7.EE.B.3

When is it particularly helpful to use a calculator for verification?

• When working with percentages

• When working with decimals

• When working with fractions

• When working with whole numbers

Tags

CCSS.7.EE.B.3