21 st Century Lessons Evaluating Expressions Order of Operations 2 1.
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Transcript of 21 st Century Lessons Evaluating Expressions Order of Operations 2 1.
21st Century Lessons
Evaluating ExpressionsOrder of Operations 2
1
Warm Up/Do Now
Agenda
2
Evaluate:22050
2
12050 1) 2)
3) What do you notice about the answers to #1 and #2?
40 40
What do you think caused that?
Dividing by 2 and multiplying by one-half give the same result.
OBJECTIVE: SWBAT evaluate expressions using the order of operations.LANGUAGE OBJECTIVE: SWBAT identify and correctly use the mathematical vocabulary: expression and evaluate.
Agenda:
1) Warm Up 2) 1st Launch
• Mini Summary
6) Assessment/3-2-1
3
Independent
OBJECTIVE: SWBAT evaluate expression using the order of operations.
LANGUAGE OBJECTIVE: SWBAT identify the words expression and evaluate.
Independent
Multiplication/Division?- Whole Class and Partners
3) 2nd Launch
5) Practice
• Wrap Up
• Example • Quick Note
• Summary
Partners
Whole Class
Whole Class
Addition/Subtraction?- Whole Class and Partners
Whole Class
Complete the Phrase- Partners
Complete the Phrase- Whole Class
• Mini Summary Whole Class
Whole Class 4) Practice
Agenda
1st Launch-Multiplication/Division?
4
You have learned that there is an order to evaluating expressions correctly. Today you will be learning some important ideas about the order.
2) Now evaluate the expression using the correct order.
1) What are the three operations in the problem?
Look at the expression below
Order of Operations
52204
Agenda
6
52204 What is your answer?What order did you use?
Online
Calculator
×𝑜𝑟 ÷?So…..What do we do first, multiplication or division?
Order of Operations
4 54
Possible Answers
1050
54
1st Launch-Multiplication/Division?
Agenda
8
The rule is when you have multiplication and division, in the same expression, you evaluate whichever comes first: Ieft to right.
Multiplication is done first Division is done first
Mini-Summary
Lets look at 2 examples.
93616 a) 541232 b)16 9 32 5
Optional Proof
ORDER OF OPERATIONS
1) Parenthesis or Grouping Symbols
2) Exponents
3) Multiplication/Division
4) Addition/Subtraction
18 3
Agenda
10
1) What are the three operations in the problem?
Look at the expression below
Order of Operations
2) Now evaluate the expression using the correct order.
211020
2nd Launch-Addition/Subtraction?
Agenda
2nd Launch-Addition/Subtraction?
12
211020
+𝑜𝑟 −? 10202
So…..What do we do first, addition or subtraction?
Order of Operations
You evaluate whichever comes first: left to right.
Online
Calculator
What is your answer?What order did you use?
Possible Answers
21012
Agenda
14
The rule is when you have addition and subtraction, in the same expression, you evaluate whichever comes first: Ieft to right. Just like multiplication and division
Addition is done first Subtraction is done first
Mini-Summary
Lets look at 2 examples.
5610 a) 21032 b)5 2
Optional Proof
ORDER OF OPERATIONS
1) Parenthesis or Grouping Symbols
2) Exponents
3) Multiplication/Division
4) Addition/Subtraction
16 22
Agenda
Launch-Wrap Up
16
Open to your notes.
The Order of Operations1) Parentheses or Grouping Symbols2) Exponents3) Multiplication/Division
4) Addition/Subtraction
from left to right whichever comes first
from left to right whichever comes first
( )( )
New Understanding
Agenda
5.36
Practice- Example
17
Practice with your partner. Evaluate the expression.
5.1233055 5.12555.155
5.1
5.36AnswerProve the answer by showing your steps.
1020
35
Agenda
Practice- Quick Note
18
In Mr./Ms. (Insert teacher’s name)7th grade math class,
5.1233055 this problem will be written another way.
For the rest of the lesson, and year, you will see this new way of writing multiplication. So be ready!!!!
7th grade way
What is different?33055 5.12
Agenda
Practice- Complete the Phrase
19
4310 2 3. 13 * LOVE
18 * VAMPIRE86 * THE8 * FANGS2610 1.
4330 2.24 * WITH
20 * IN
58 * DOOR
8 * BLOOD
5260 3 7.241632 8.262450 9.
12 * GOBLIN
70 * ABOUT81* GIRL
13 * WHO83 147 12.
2)54( 10.2338 3 11.
81 * SPOOK8 * FELL66 * THE29 * NECKS4965 6.
2544.2)610( 5.
Name_____________________________ Date____________CLASSWORK: ORDERS OF OPERATIONS LESSON 2
DID YOU HEAR…….Directions: Evaluate each expression in each box and find your answer in the column to the right. Write the word next to the answer in the box containing the problem number at the bottom of the page. For each set of exercises, there is one extra answer.
SHOW YOUR WORK/STEPS BELOW
Agenda
Summary- Complete the Phrase
20
Do you need to see the work for any of the problems?
3.
1.2. 5260 3
7.8.
241632
262450 9.
83 147 12.
2)54( 10.2338 3 11.
4965 6.
2544.2)610( 5.
4310 2
2610 4330
Click any expression to review
Click here to reveal the answer to the riddle.
Agenda
Assessment- 3-2-1
34
Complete the 3-2-1 below:
things you have learned today.questions you still have.
expression to evaluate.
321
425337 38
Agenda