OAT Lesson 14: Write Expressions Where Letters Stand for Numbers

Last updated about 3 years ago

25 Nsɛmmisa

Lesson Synthesis: - (10 min)

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OAT Lesson 14: Write Expressions Where Letters Stand for Numbers

Last updated about 3 years ago

25 Nsɛmmisa

Develop Understanding

Today's Learning Goal: (G6, U6, L6)

Explain (orally) how to create and solve an equation that represents a situation with an unknown amount.
Write an expression with a variable to generalize the relationship between quantities in a situation.

Today's Materials:

Laptop
Laptop charger
Pen/Pencil/Paper/Expo Marker (optional)

Please complete the Jump Start (activator). You have 5 minutes before we review. This is independent it should be silent.

Reminders:

1. Ready for class

2. No cellphones

3. Volume must be low.

4. Read and follow all directions

5.) Take your bag off and immediately begin the Activator.

JUMP START: Algebra Talk: When x is 6 - ( 5min)

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If x is 6, what is:

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Launch: - (10 min)

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I do (question

We do (question

You do (question)

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Instructions for a craft project say that the length of a piece of red ribbon should be 7 inches less than the length of a piece of blue ribbon.
How long is the red ribbon if the length of the blue ribbon is 10 inches?

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Tyler has 3 times as many books as Mai.
How many books does Mai have if Tyler has 15 books?

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A bottle holds 24 ounces of water. It has x ounces of water in it.
What does 24 - x represent in this problem?

Activity 1: Lemonade Sales and Heights - (10 min)

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Lin set up a lemonade stand. She sells the lemonade for $0.50 per cup.
Complete the table to show how much money she would collect if she sold each number of cups.

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How many cups did she sell if she collected $127.50? Be prepared to explain your reasoning.

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Activity 2: Building Expressions

(15 min)

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Two-fifths of the vegetables in Priya’s Garden are tomatoes.

How many tomatoes are there if Priya’s Garden has:

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A school paid $31.25 for each calculator.

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Lesson Synthesis: - (10 min)

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Today we seen examples of different kind of expressions.

We also learned how to translate verbal and algebraic expressions.

Example:

I have half as many books as your friend, and you have 130 books. Your friend's number of books is the unknown quantity, let’s call it b.

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Create a story similar to situations seen in class and create an equation that represents the story. Be sure to explain what your unknown quantity represents.

Cool Down: Crazy Eights - (5 min)

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A plant measured x inches tall last week and 8 inches tall this week

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Select the expression that represents the number of inches the plant grew this week. Explain how you know.

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For the expression not chosen, describe a situation that the expression might represent.

Closure Questions:

What is the difference between an expression and an equation?
Translate this verbal expression into an algebraic equation.

I had x amount of dollars last week. This week I made $10 more dollars. Now I have $50. How much money I had last week?

OAT Lesson 14: Write Expressions Where Letters Stand for Numbers

Lesson Synthesis: - (10 min)

OAT Lesson 14: Write Expressions Where Letters Stand for Numbers

JUMP START: Algebra Talk: When x is 6 - ( 5min)

If x is 6, what is:

Launch: - (10 min)

Instructions for a craft project say that the length of a piece of red ribbon should be 7 inches less than the length of a piece of blue ribbon.How long is the red ribbon if the length of the blue ribbon is 10 inches?

Tyler has 3 times as many books as Mai.How many books does Mai have if Tyler has 15 books?

A bottle holds 24 ounces of water. It has x ounces of water in it. What does 24 - x represent in this problem?

Activity 1: Lemonade Sales and Heights - (10 min)

Lin set up a lemonade stand. She sells the lemonade for $0.50 per cup. Complete the table to show how much money she would collect if she sold each number of cups.

How many cups did she sell if she collected $127.50? Be prepared to explain your reasoning.

Activity 2: Building Expressions

(15 min)

Two-fifths of the vegetables in Priya’s Garden are tomatoes.

How many tomatoes are there if Priya’s Garden has:

A school paid $31.25 for each calculator.

Lesson Synthesis: - (10 min)

Today we seen examples of different kind of expressions.

We also learned how to translate verbal and algebraic expressions.

Example:

I have half as many books as your friend, and you have 130 books. Your friend's number of books is the unknown quantity, let’s call it b.

Create a story similar to situations seen in class and create an equation that represents the story. Be sure to explain what your unknown quantity represents.

Cool Down: Crazy Eights - (5 min)

A plant measured x inches tall last week and 8 inches tall this week

Select the expression that represents the number of inches the plant grew this week. Explain how you know.

For the expression not chosen, describe a situation that the expression might represent.

Closure Questions:

JUMP START: Algebra Talk: When x is 6 - ( 5min)

If x is 6, what is:

Launch: - (10 min)

Instructions for a craft project say that the length of a piece of red ribbon should be 7 inches less than the length of a piece of blue ribbon.How long is the red ribbon if the length of the blue ribbon is 10 inches?

Tyler has 3 times as many books as Mai.How many books does Mai have if Tyler has 15 books?

A bottle holds 24 ounces of water. It has x ounces of water in it. What does 24 - x represent in this problem?

Activity 1: Lemonade Sales and Heights - (10 min)

Lin set up a lemonade stand. She sells the lemonade for $0.50 per cup. Complete the table to show how much money she would collect if she sold each number of cups.

How many cups did she sell if she collected $127.50? Be prepared to explain your reasoning.

Elena is 59 inches tall. Some other people are taller than Elena. Complete the table to show the height of each person.

If Noah is 64 3/4 inches tall, how much taller is he than Elena?

Activity 2: Building Expressions

(15 min)

Clare is 5 years older than her cousin.

How old would Clare be if her cousin is:

10 years?

2 years?

x years?

Clare is 12 years old. How old is Clare’s cousin?

Diego has 3 times as many comic books as Han.

How many comic books does Diego have if Han has:

6 comic books?

n books?

Two-fifths of the vegetables in Priya’s Garden are tomatoes.

How many tomatoes are there if Priya’s Garden has:

20 vegetables?

x vegetables?

Priya’s garden has 6 tomatoes. How many total vegetables are there?

A school paid $31.25 for each calculator.

If the school bought x calculators, how much did they pay?

The school spent $500 on calculators. How many did the school buy?

Today we seen examples of different kind of expressions.

We also learned how to translate verbal and algebraic expressions.

Example:

I have half as many books as your friend, and you have 130 books. Your friend's number of books is the unknown quantity, let’s call it b.

Create a story similar to situations seen in class and create an equation that represents the story. Be sure to explain what your unknown quantity represents.

Cool Down: Crazy Eights - (5 min)

A plant measured x inches tall last week and 8 inches tall this week

Select the expression that represents the number of inches the plant grew this week. Explain how you know.

For the expression not chosen, describe a situation that the expression might represent.

Closure Questions:

Elena is 59 inches tall. Some other people are taller than Elena. Complete the table to show the height of each person.

If Noah is 64 3/4 inches tall, how much taller is he than Elena?

Clare is 5 years older than her cousin.

How old would Clare be if her cousin is:

10 years?

2 years?

x years?

Clare is 12 years old. How old is Clare’s cousin?

Diego has 3 times as many comic books as Han.

How many comic books does Diego have if Han has:

6 comic books?

Instructions for a craft project say that the length of a piece of red ribbon should be 7 inches less than the length of a piece of blue ribbon.
How long is the red ribbon if the length of the blue ribbon is 10 inches?

Tyler has 3 times as many books as Mai.
How many books does Mai have if Tyler has 15 books?

A bottle holds 24 ounces of water. It has x ounces of water in it.
What does 24 - x represent in this problem?

Lin set up a lemonade stand. She sells the lemonade for $0.50 per cup.
Complete the table to show how much money she would collect if she sold each number of cups.

Instructions for a craft project say that the length of a piece of red ribbon should be 7 inches less than the length of a piece of blue ribbon.
How long is the red ribbon if the length of the blue ribbon is 10 inches?

Tyler has 3 times as many books as Mai.
How many books does Mai have if Tyler has 15 books?

A bottle holds 24 ounces of water. It has x ounces of water in it.
What does 24 - x represent in this problem?

Lin set up a lemonade stand. She sells the lemonade for $0.50 per cup.
Complete the table to show how much money she would collect if she sold each number of cups.

Elena is 59 inches tall. Some other people are taller than Elena.
Complete the table to show the height of each person.

Elena is 59 inches tall. Some other people are taller than Elena.
Complete the table to show the height of each person.