Lesson 10 Objective: Compare and evaluate expressions with parentheses.

By the end of the lesson, you will be able to…

5th Grade Module 4– Lesson 10K. Clauson

Convert Measures from Small to Large Units

12 in = _______ ft How many feet are in 12 inches?

24 in = _______ ft

36 in = _______ ft

48 in = _______ ft

120 in = _______ ft

2 c = _______ pt How many pints are in 2 cups?

4 c = _______ pt

6 c = _______ pt

16 c = _______ pt

Multiply a fraction and a whole number

Find the Unit Conversion

Application ProblemBridget has $240. She spent 3/5 of her money and saved the rest. How much more money did she spend than save?

Problem 1: Write an expression to match a tape diagram.

Then, evaluate.

Read the expression that names the whole.

What do we call the answer to an addition sentence?

How many units is the sum being divided into?

What is the name of that fractional unit?

How many fourths are we trying to find?

So, this tape diagram is showing 3 fourths of the sum of 9 and 11. Work with a partner to write a numerical expression to match these words.

Problem 1: Write an expression to match a tape diagram.

Then, evaluate.

3 fourths the sum of 9 and 11

(9 + 11) × ¾.

¾ × (9 + 11)

9 + 11 X 3 4

I noticed that many of you put parentheses around 9 + 11. Explain to a neighbor why that is necessary.

The parentheses tell us to add 9 and 11 first, and then multiply. If the parentheses weren’t there, we would have to multiply first. We want to find the sum first, and then multiply.

What is the final answer?

Problem 1: Write an

expression to match a tape

diagram. Then,

evaluate.

Problem 1: Write an expression to match a tape diagram.

Then, evaluate.

Look at this model. How is it different from the previous example?

This time, we don’t know the whole. In this diagram, the whole is being divided into fifths, not fourths. Here, we know what 1 fifth is. We know it is the difference of 1/3 and 1/4. We have to multiply the difference of 1/3 and 1/4 by 5 to find the whole.

Problem 1: Write an expression to match a tape diagram.

Then, evaluate.

Read the subtraction expression that tells the value of one unit (or 1 fifth) in the model.

What is the name for the answer to a subtraction problem?

This unit is the difference of one-third and one-fourth.

How many of these (1/3−1/4) units does our model show?

Work with a partner to write a numerical expression to match these words. 5 units of 1/3−1/4

Problem 1: Write an expression to match a tape diagram.

Then, evaluate.

5 ×(1/3−1/4) or (1/3−1/4) × 5.

Do we need parenthesesfor this expression?

What is the final answer?

Problem 1: Write an

expression to match a tape

diagram. Then,

evaluate.

Problem 2: Write and evaluate an expression from word form.

the product of 4 and 2, divided by 3

Let’s read this expression!

Work with a partner to write a matching numerical expression.

(4 × 2) ÷ 34 × 2 34 × 2 ÷ 3

Were the parentheses necessary here? Why or why not?

Problem 2: Write and evaluate an expression from word form.

the product of 4 and 2, divided by 3

(4 × 2) ÷ 34 × 2 34 × 2 ÷ 3

Work independently to evaluate your expression. Express your answer as both a fraction greater than one (improper fraction) and a mixed number. Check your work with a neighbor when you’re finished.

Problem 3: Evaluate and compare equivalent expressions.

a. 2 ÷ 3 × 4 b. 4 thirds doubled c. 2 ÷ (3 × 4) d. 2/3 × 4 e. 4 copies of the sum of one-third and one-thirdf. (2 ÷ 3) × 4

Evaluate these expressions with your partner. Continue working until I call time. Be prepared to share.

Problem 3: Evaluate and compare equivalent expressions.

a. 2 ÷ 3 × 4 b. 4 thirds doubled c. 2 ÷ (3 × 4) d. 2/3 × 4 e. 4 copies of the sum of one-third and one-thirdf. (2 ÷ 3) × 4

What do you notice?

The answer is 8 thirds every time, except (c). All of the expressions are equivalent, except (c). These are just different ways of expressing 8/3.

What was different about (c)?

Since the expression had parentheses, we had to multiply first, and then divide. It was equal to 2 twelfths.

Problem 5: Compare expressions in word and numerical forms.

a. 𝟏/ the sum of 6 and 14 (6 + 14) ÷ 8 𝟖

b. 4 × / 4 times the quotient of 3 and 8 𝟖 𝟑

c. Subtract 2 from / of 9 (11 ÷ 2) – 2 𝟏 𝟐

Let’s use <, >, or = to compare expressions.

Answers are on the next slide…..

Problem 5: Compare expressions in word and numerical forms.

a. 𝟏/ the sum of 6 and 14 (6 + 14) ÷ 8 𝟖

b. 4 × / 4 times the quotient of 3 and 8 𝟖 𝟑

c. Subtract 2 from / of 9 (11 ÷ 2) – 2 𝟏 𝟐

Let’s use <, >, or = to compare expressions.

=

>

<

Get Ready to Finish theProblem Set on Your Own!

Complete Lesson 10.

You will have 10 minutes to work.Try your Best!

5th Grade Module 4– Lesson 10

K. Clauson

5th Grade Module 4- Lesson 10

K. Clauson

LET’S DEBRIEF

• Take 2 minutes to check your answers with your partner.• Let’s share any insights you had while solving these

problems.

5th Grade Module 4– Lesson 10

K. Clauson

EXITTICKETLESSON 10