To Start 15 Points Classify the following expressions

To Start: 15 Points � Classify the following expressions as variable or numerical: � 1. 45 -10 � 2. x + 6 � 3. 3(r/5) - 3

CHAPTER 1: ALGEBRAIC EXPRESSIONS AND INTEGERS Section 1 -2: Order of Operations

Order of Operations � How many different answers can we get from: � 3 * 6 + 9 / 3 – 1? ? ? � � � 8? 14? 20? 18 + 3 – 1 = 20 20!

PEMDAS � What is PEMDAS? ? ? Please Excuse My Dear Aunt Sally

Order of Operations � 1. Substitute for known variables � 2. Parentheses � 3. Exponents and Roots � 4. Multiplication and Division (left to right) � 5. Addition and Subtraction (left to right)

Practice #1 Order of Operations � Evaluate the following: � 13 + 2 * 5 � 13 + 10 � 23!

Practice #2 Order of Operations � Evaluate the following: � 6 - 4 * 3 + 7 � 6 – 12+ 7 � -6+7 � 1!

You Try!!! � Evaluate the following: � 2 +4/2+2 � 11 - 2 * 3 + 4 � 2+2+2 � 11 – 6 + 4 � 4+2 � 5+4 � 6! � 9!

You Try Again!!! � Evaluate the following: � 2 +8/2+4 � 7 - 2 /2 + 5 � 2+4+4 � 7– 1 +5 � 6+4 � 6+5 � 10! � 11!

Practice #3 Order of Operations � Evaluate the following: � (3 * 4 + 7) + (2 *4 + 3 * 4) � (12 + 7) + (8 + 12) � 19 + 20 � 39!

Practice #4 Order of Operations � Evaluate the following: � 4[(3 – 2 + 5) + 1] Work parentheses inside out!! � 4[(6) + 1] � 4[7] � 28!

You Try!!! � Evaluate the following: � 3[(3 – 4 + 5) + 1] � 3[(-1+5) +1] � � (3 * 5 + 2) + (2 *3 + 1 * 4) � (15+2) + (6+4) � 17 + 10 3[4+1] = 3(5) � 15! � 27!

Homework!!!! � Page 11: � 1 -3 Together � 4 -21 � Day 2 � Page 11: 22 -32 � 1. 2 Worksheet