Lesson 1.10: Numerical Expressions

Lesson 1.10: Numerical Expressions

Clayton's Math Lesson

Open Ended

ESSENTIAL QUESTION: How can you use a numerical expression to describe a situation?

NUMERICAL EXPRESSION pg. 61

a mathematical phrase that has numbers and operations signs but DOES NOT have an equal sign.

Open Ended

Tyler caught 15 small bass, and his dad caught 12 small bass in the Memorial Bass Tourney in Tidioute, PA. Write an numerical Expression to represent how many fish they caught in all.

EXAMPLE 1

• Addition - Emma has 11 fish in her aquarium. She buys 4 more fish. (11 (fish) + (plus) 4 (more fish))

• Subtraction - Lucia has 128 stamps. She uses 38 stamps on party invitations. (128 - ___ )

• Multiplication - Karla buys 5 books. Each book cost $3. ( ____ x ____ )

• Division - Four players share 52 cards equally. ( ____ ÷ ____ )

EXAMPLE 2: Expressions with (Parentheses)

• Doug went fishing for 3 days. Each day he put $15 in his pocket. At the end of each day, he had $5 left. How much money did Doug spend by the end of the trip?

• Underline the events for each day.

• Circle the number of days these events happened.

Poll

Which problem matches the expression $20 - ( $12 + $3 ) ?

• Kim has $20 to spend for her fishing trip. She spends $12 on a fishing pole. Then she finds $3. How much money does Kim have now?

• Kim has $20 to spend for her fishing trip. She spends $12 on a fishing pole and $3 on bait. How much money does Kim have now?

Multiple Choice

SHARE and SHOW: Circle the expression that matches the words.

Teri had 18 worms. She gave 4 worms to Susie and 3 worms to Jamie.

• (18 - 4) + 3

• 18 - (4 + 3)

Multiple Choice

SHARE and SHOW: Circle the expression that matches the words.

Rick had $8. He then worked 4 hours for $5 each hour.

• $8 + (4 x $5)

• ($8 + 4) x $5

Open Ended

Write an expression to match the words.

3. Greg drives 26 miles on Monday and 90 miles on Tuesday.

Open Ended

Write an expression to match the words.

4. Lynda has 27 fewer fish than Jack. Jack has 80 fish.

Open Ended

MATH TALK:

Is 4 x 8 = 32 an expression? Explain Why or why not?

Open Ended

Write an expression to match the words.

Jose shared 12 party favors equally among 6 friends.

Open Ended

Write an expression to match the words.

Braden has 14 baseball cards. He finds 5 more baseball cards.

Open Ended

Write an expression to match the words.

Isabelle bought 12 bottles of water at $2 each.

Open Ended

Write an expression to match the words.

Monique had $20. She spent $5 on lunch and $10 at the bookstore.

Homework Homework Homework

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