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Published byBeatrix Snow Modified over 6 years ago

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Order of Operations ( ) + X - 4343

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The Order of Operations tells us how to do a math problem with more than one operation, in the correct order.

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P lease E xcuse M y D ear A unt S ally This will help to you to remember the order of operations.

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Add + Subtract - Multiply x Divide Please Excuse My Dear Aunt Sally P E MDMD ASAS Parentheses ( ) Exponents 4 3

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Please Excuse My Dear Aunt Sally Parentheses ( ) Always do parentheses 1 st.

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Please Excuse My Dear Aunt Sally Exponents 4 3 Always do Exponents 2 nd.

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Multiply x Divide Please Excuse My Dear Aunt Sally Do multiplication and division 3 rd, from left to right.

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Add + Subtract - Please Excuse My Dear Aunt Sally Do addition and subtraction 4th, from left to right.

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Let’s Try Some Problems!

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PEMDAS 3+2 3 - (9+1) 3+2 3 - 10 3+8-10 11-10 1

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PEMDAS 3 (9+1) + 6 2 3(10)+6 2 3(10)+36 30+36 66

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PEMDAS 4+ 10 x 2 3 -16 4+10 x 8 -16 4+ 80 -16 84-16 68

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PEMDAS 10+7 2 -2 x 5 10+49–2 x 5 10+49- 10 59 - 10 49

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PEMDAS 64 (9 x 3-19) 64 (27 –19) 64 8 8

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Now let’s try substitution. Now let’s try substitution. Evaluate the following expressions when a = 3 and b = -2 1)4x + b 3 4(3) + (-2) 3 4(3) + -8 4(3) - 8 or 12 + -8 4 12 - 8 4

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