Exploring Rational Expressions: Addition and Subtraction Techniques

The video tutorial provides reminders and tips for working with rational numbers, focusing on multiplying and dividing. It reviews operations with decimals and fractions, emphasizing the importance of fluency. Key points include not lining up decimals for multiplication, adjusting decimal points for division, and converting whole and mixed numbers to fractions. The tutorial concludes with encouragement for students to seek help if needed and to practice for fluency.

What are the main topics covered this week?

• Solving algebraic equations

• Adding and subtracting rational numbers

• Multiplying and dividing rational numbers

• Graphing linear equations

Tags

CCSS.7.NS.A.1C

How do you determine the sign of the result when multiplying or dividing rational numbers?

• By the number of positive numbers

• By the number of negative numbers

• By the sum of the numbers

• By the product of the numbers

Tags

CCSS.7.NS.A.2A

When multiplying decimals, should you line up the decimal points?

• No, never

• Yes, but only for whole numbers

• No, only when adding or subtracting

• Yes, always

Tags

CCSS.5.NBT.B.7

What should you do to the divisor when dividing decimals?

• Move the decimal point to make it a whole number

• Leave it as it is

• Add a zero to the end

• Subtract a zero from the end

Tags

CCSS.5.NBT.B.6

CCSS.6.NS.B.2

Do you need a common denominator when multiplying fractions?

• No, never

• No, only when adding or subtracting

• Yes, always

• Yes, but only for mixed numbers

Tags

CCSS.5.NF.B.6

What is the first step when multiplying mixed numbers?

• Find a common denominator

• Convert them to improper fractions

• Add the fractions

• Divide the fractions

Tags

CCSS.5.NF.B.6

What does 'keep, change, flip' refer to?

• Dividing fractions

• Adding fractions

• Subtracting fractions

• Multiplying fractions

Tags

CCSS.6.NS.A.1

What should you do if you need more practice with operations on rational numbers?

• Ask a friend to do it for you

• Seek help and practice more

• Ignore it

• Wait until the next class

Tags

CCSS.7.NS.A.1D

Why is it important to be fluent in operations with rational numbers?

• To finish homework quickly

• To impress your teacher

• To help your classmates

• To avoid struggling through problems

Tags

CCSS.7.NS.A.1D

What is the benefit of canceling when multiplying fractions?

• It is not necessary

• It changes the answer

• It makes the problem easier

• It makes the problem harder

Tags

CCSS.5.NF.B.6