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21 st Century Lessons Writing Algebraic Expressions Lesson 2 1

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Warm Up Agenda 2 1)Sally made 20 more shots than Kevin, k. Write an algebraic expression to represent how many shots Sally made. 2) Damon bought a bin of 68 sour candies. He ate c candies. Write an algebraic expression to represent how many candies Damon has left. 3) What were the key words that helped you write the algebraic expressions for the problems above? k+2020+k or 68 – c OBJECTIVE: SWBAT write algebraic expressions using grouping symbols and the phrase less than. As well as write written expressions from algebraic expressions. Language Objective: SWBAT speak with a partner about translations between algebra and English.

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Agenda: 1) Warm Up 2) Launch 3) Explore 1 5) Practice 6) Assessment 3 Agenda Marvin’s Math- Whole Class Marvin’s Math Part 1- Whole Class Marvin’s Math Part 2- Whole Class4) Explore 2 Class Work- Partners Individual Exit Slip- Individual OBJECTIVE: SWBAT write algebraic expressions using grouping symbols and the phrase less than. As well as write written expressions from algebraic expressions. Language Objective: SWBT to translate the meaning ‘sum of’ and ‘difference of’ into algebraic expressions.

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Launch- Marvin’s Math Agenda 4 4 Pick a number, add two, multiply by five. What number did you pick? What was your result? What did you do first?What did you do second? Now everyone, let’s use the same number 18. Let’s get a few volunteers.

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Agenda 5 5 Pick a number, add two, multiply by five. What was everyone’s result using 18? Turn and talk: Is Marvin’s expression correct? Explain your reasoning. Great! Everyone’s response is 100. This is my numerical expression using the number 18. Explore- Marvin’s Math: Part 1

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6 Turn and talk: Is Marvin’s expression correct? No! What do we need to do in order to make this expression equal 100? Hint Agenda Explore- Marvin’s Math: Part 1

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7 Turn and talk: Is Marvin’s expression correct? No! What do we need to do in order to make this expression equal 100? Since we have to add first, what can we use to show that we want to perform addition FIRST? Agenda Explore- Marvin’s Math: Part 1

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8 Agenda Our goal is to write this as an Pick a number, add two, multiply by five. Explore- Marvin’s Math: Part 1 If 10 is picked If 1 is picked

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9 How do you think we should write as a written expression? Let’s break it down into 2 parts. The sum of a number and two. The word sum prompts you to add first. The sum of a number and two, times five. Next we combine the two parts. Agenda Explore- Marvin’s Math: Part 1 Our next goal is to write this as an

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10 Ex. 1 Write a for Four times the difference of a number and six Ex. 2 Write an for The sum of a number and two, times five. Practice problems The sum of a number and four, divided by ten or Agenda Explore- Marvin’s Math: Part 1 OBJECTIVE ALERT

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Explore –Marvin's Math: Part 2 11 Agenda 30 less than x Marvin knows 30 fewer math tricks than his friend. Which is correct? Lets go back to our basics to figure it out… Here is the showing the number of tricks Marvin knows. a)b)

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12 1. What is 30 less than 50? Turn and Talk: When you see “less than” in a written expression, what is important? What did you do to get your answer? 2. What is 30 less than 72? 3. What is 30 less than 56? 4. What is 30 less than x? Agenda Explore –Marvin's Math: Part 2 20 50 - 30 42 72 - 30 26 56 - 30 x - 30

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13 Agenda 30 less than x Marvin knows 30 fewer math tricks than his friend. Here is the written expression showing the number of tricks Marvin knows. a)b) Explore –Marvin's Math: Part 2

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Practice- Class Work 14 Agenda Name__________________Date____________ Class Work Lesson 4 a) five less than three times a number c) nine times the sum of a number and fifteen g) The sum of half a number and four e) one plus the product of a number and five h) seven less than a third of the sum of a number and two f) A number less than twenty five d) The sum of twice a number and seven b) eight less than the quotient of a number and two 1) Directions: Write an algebraic expression for each. 2) Directions: Write two written expression for each. Use the key vocabulary. a)b) Let’s do the first one together.

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15 Agenda Name__________________Date____________ Class work lesson 4 a) five less than three times a number c) nine times the sum of a number and fifteen g) The sum of half a number and four e) one plus the product of a number and five h) seven less than a third of the sum of a number and two f) A number less than twenty five d) The sum of twice a number and seven b) eight less than the quotient of a number and two 1) Directions: Write an algebraic expression for each. 2) Directions: Write two written expression for each. Use the key vocabulary. a)b) Let’s do the first one together. Important!!!! Identify the operation(s) by underlining key words. Practice- Class Work

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Practice- Class Work Summary 16 Agenda Name__________________Date____________ Class Work Lesson 4 a) Five less than three times a number c) Nine times the sum of a number and fifteen g) The sum of half a number and four e) One plus the product of a number and five h) Seven less than a third of the sum of a number and two f) A number less than twenty five d) The sum of twice a number and seven b) Eight less than the quotient of a number and two 1) Directions: Write an algebraic expression for each. 2) Directions: Write two written expression for each. Use the key vocabulary. e) a) c) g) b) d) f)

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17 Agenda Name__________________Date____________ Class Work Lesson 4 b) Eight less than the quotient of a number and two 1) Directions: Write an algebraic expression for each. Click to Return Practice- Class Work Summary

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18 Agenda Name__________________Date____________ Class Work Lesson 4 1) Directions: Write an algebraic expression for each. c) Nine times the sum of a number and fifteen Click to Return Practice- Class Work Summary

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19 Agenda Name__________________Date____________ Class Work Lesson 4 1) Directions: Write an algebraic expression for each. d) The sum of twice a number and seven Click to Return Practice- Class Work Summary

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20 Agenda Name__________________Date____________ Class Work Lesson 4 1) Directions: Write an algebraic expression for each. e) One plus the product of a number and five Click to Return Practice- Class Work Summary

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21 Agenda Name__________________Date____________ Class Work Lesson 4 1) Directions: Write an algebraic expression for each. f) A number less than twenty five Click to Return Practice- Class Work Summary

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22 Agenda Name__________________Date____________ Class Work Lesson 4 1) Directions: Write an algebraic expression for each. g) The sum of half a number and four Click to Return Practice- Class Work Summary

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23 Agenda Name__________________Date____________ Class Work Lesson 4 1) Directions: Write an algebraic expression for each. h) Seven less than a third of the sum of a number and two Click to Return Practice- Class Work Summary

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24 Agenda 2) Directions: Write two written expression for each. Use the key vocabulary. a) Click to Return Ten minus a number A number less than ten Ten subtracted by a number Practice- Class Work Summary

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25 Agenda 2) Directions: Write two written expression for each. Use the key vocabulary. b) Click to Return The sum of a number and nine, times ten The sum of a number and nine multiplied by ten Ten times the sum of a number and nine Practice- Class Work Summary

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26 Agenda 2) Directions: Write two written expression for each. Use the key vocabulary. c) Click to Return The sum of a number and thirteen, times seven Seven times the sum of a number and thirteen Seven multiplied by the sum of a number and thirteen Practice- Class Work Summary

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27 Agenda 2) Directions: Write two written expression for each. Use the key vocabulary. d) Click to Return Two times a number plus twelve Twice a number plus twelve Twelve more than two times a number Practice- Class Work Summary

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28 Agenda 2) Directions: Write two written expression for each. Use the key vocabulary. e) Click to Return A number divided by 10 The quotient of a number and 10 One-tenth of a number Practice- Class Work Summary

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29 Agenda 2) Directions: Write two written expression for each. Use the key vocabulary. f) Click to Return Two divided by the difference of a number and thirteen The quotient of two and the difference of a number and thirteen Practice- Class Work Summary

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30 Agenda 2) Directions: Write two written expression for each. Use the key vocabulary. g) Click to Return A number times the difference of ten and another number A number multiplied by the difference of ten and another number Practice- Class Work Summary

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Assessment-Exit Slip 31 Agenda 1)Write an algebraic expression for Three times the sum of a number and eight 2) Write a written expression for the algebraic expression using less than. 3)Write an algebraic expression for Ten less than the sum of a six and a number A number less than nine

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