Mastering Multiplication and Division of Rational Numbers

The video tutorial covers multiplying and dividing rational numbers, focusing on using negative number skills. It includes examples of dividing mixed numbers and multiplying decimals, emphasizing the importance of estimating and checking answers. A real-life application involving stock values is presented to calculate the mean change. The tutorial concludes with practice problems for students to solve and check their understanding.

When multiplying decimals, what is the first step?

• Multiply across

• Align the decimals

• Add the numbers

• Convert to fractions

What is the reciprocal of 2/3?

• 3/2

• 2/3

• 1/3

• 3/1

What is the result of -5 1/5 divided by 2 1/3?

• -1.5

• -2.5

• -4.5

• -3.5

When converting mixed numbers to improper fractions, what is the correct formula?

• Denominator x Whole Number - Numerator

• Denominator x Numerator + Numerator

• Denominator + Numerator

• Denominator x Whole Number + Numerator

What is the product of -2.5 and 3.6?

• -9

• -8

• -7.5

• -10

How do you handle the decimal point when multiplying decimals?

• Place it at the end

• Align it to the right

• Align it to the left

• Ignore it

What is the mean change in stock values if the changes are -180.39, -280.52, and 127.28?

• -111.21

• -120.21

• -130.21

• -140.21

What is the first step in finding the mean of a set of numbers?

• Multiply all numbers

• Add all numbers

• Subtract all numbers

• Divide all numbers

When adding two negative numbers, what is the result?

• It depends on the numbers

• Zero

• A negative number

• A positive number

What should you do if you can't find the error in your solution?

• Ask a friend

• Try working it out on your own

• Skip the problem

• Guess the answer