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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.