Numerical Expressions

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Presentation transcript:

Numerical Expressions What is a numerical expression??? How do we write one?

Numerical Expressions A numerical expression is a mathematical phrase that has numbers and operational signs but does not have a equal sign.

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

Numerical Expressions Choose which operation to use. You need to join groups of different sizes, so use addition. 15 small bass + 12 small bass 15 + 12 So 15 + 12 represents how many fish they caught in all.

Numerical Expressions Write an expression to match the words. Emma has 11 fish in her aquarium. She buys 4 more fish. Lucia has 128 stamps. She uses 38 stamps on party invitations.

Numerical Expressions Write an expression to match the words. Karla buys 5 books. Each book cost $3. Four players share 52 cards equally.

Numerical Expressions Expressions with parentheses: The meaning of the words in a problem will tell you where to place the parentheses in an expression. 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 week?

Numerical Expressions What expression can you write to show how much money Doug spends in one day? ( -- ) Now how can you show how much money Doug spends in 3 days? ____ X ( -- )

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

Numerical Expressions 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? First: Kim has $20 Next: ________________ Then: ________________ Does this match the expression?

Numerical Expressions 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? First: Kim has $20 Next: __________________ Then: ____________________ Do these words match the expression?

Numerical Expressions Which matches the words? Teri had 18 worms. She gave 4 worms to Susie and 3 worms to Jamie. (18 – 4) + 3 18 – (4 + 3)

Numerical Expressions Rick had $8. He then worked 4 hours for $5 each hour. $8 + (4 x $5) ($8 + 4) x $5

Numerical Expressions Write an expression to match the words. Greg drives 26 miles on Monday and 90 miles on Tuesday. Lynda has 27 fewer fish than Jack. Jack has 80 fish.

Numerical Expressions Write words to match the expression. 34 – 17 6 x (12 – 4)

Numerical Expressions Using a variable. A variable is a letter or a symbol that stands for one or more numbers. Write an expression with a variable. Rona had 96 pencils and then sold some. Tim had 17 cards. Joe gave him more. Lee gave me 12 cookies I ate 6 and then baked more.

Numerical Expressions Review Expression from textbook page 66. Set up notebook for # 8 to 18.