Write and Evaluate Expressions GOAL: By the end of this lesson, we will ALL be able to write and evaluate addition and subtraction expressions.

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Presentation transcript:

Write and Evaluate Expressions GOAL: By the end of this lesson, we will ALL be able to write and evaluate addition and subtraction expressions

Review Identity Property: Associative Property: Commutative Property: 0 Ex: = 5 ( ) Ex: (1+2) + 3 = 1 + (2+3) Flip-Flop; any order Ex: 5+4 = 4+5

Name this property … = Commutative Property

Name this property … = 69 Identity Property

Name this property … 35 + (42 +56) = ( ) + 56 Associative Property

Name this property … = Commutative Property

Name this property … 16 + ( ) = ( ) + 18 Associative Property

Name this property … = 99 Identity Property

GOAL: By the end of this lesson, we will ALL be able to write and evaluate addition and subtraction expressions Expression – has numbers and operation signs but does not have an equal sign Example: (15 + 5) – 7 Variable – a letter or symbol that represents an unknown number Example: 18 – n

# 1 Rule!!!!!!!! Remember to ALWAYS do parentheses first!

Find the value of each expression … Remember to ALWAYS do parentheses first! 14 + (7 +3) 14 + (10) = 24

Find the value of each expression … Remember to ALWAYS do parentheses first! 17 – (6-5) 17 – (1) = 16

Find the value of each expression … Remember to ALWAYS do parentheses first! (9-8) + 4 (1) = 5

Find the value of each expression … Remember to ALWAYS do parentheses first! (6 + 9) - 2 (15) = 13

Find the value of each expression … Remember to ALWAYS do parentheses first! __ - 18 if __ = 30 ___ = – 18 = 12

Find the value of each expression … Remember to ALWAYS do parentheses first! 8 - __ if __ = 6 __ = 6 8 – 6 = 2

Find the value of each expression … Remember to ALWAYS do parentheses first! 20 – (5 – c) if c = 3 C = 3 20 – (5-3) 20 – (2) 20 – 2 = 18

Write an expression to match the words … Remember you might need to add parentheses! Tom caught 15 fish. He caught 7 more. He threw 2 back. (15 + 7) - 2

Which number makes the equation __ + 5 = 14 true? A.8 B.9 C.10 B. 9

Did we meet our goal today? GOAL: By the end of this lesson, we will ALL be able to write and evaluate addition and subtraction expressions Any questions?