Writing Algebraic Expressions Lesson 4 1 Warm Up

Writing Algebraic Expressions Lesson 4 1

Warm Up 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. 1) Sally made 20 more shots than Kevin, k. Write an algebraic expression to represent how many shots Sally made. k+20 or 20+k 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. 68 – c 3) What were the key words that helped you write the algebraic expressions for the problems above? Agenda 2

Launch- Marvin’s Math Pick a number, add two, multiply by five. Let’s get a few volunteers. 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. Agenda 3

Explore- Marvin’s Math: Part 1 Marvin’s Math Pick a number, add two , multiply by five. What was everyone’s result using 18? Great! Everyone’s response is 100. This is my numerical expression using the number 18. Turn and talk: Is Marvin’s expression correct? Explain your reasoning. Agenda 4

Explore- Marvin’s Math: Part 1 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 5

Explore- Marvin’s Math: Part 1 Marvin’s Math Pick a number, add two, multiply by five. If 10 is picked If 1 is picked Our goal is to write this as an Agenda 7

Explore- Marvin’s Math: Part 1 Our next goal is to write this as an Written Expression. Let’s break it down into 2 parts. How do you think we should write as a written expression? The word sum The sum of a number and two. prompts you to add Next we combine the two parts. first. The sum of a number and two, times five. Agenda 8

Explore- Marvin’s Math: Part 1 OBJECTIVE ALERT Written Expression The sum of a number and two, times five. Practice problems Ex. 1 Write a written expression for The sum of a number and four, divided by ten Ex. 2 Write an for Four times the difference of a number and six or Agenda 9

Explore –Marvin's Math: Part 2 Marvin knows 30 fewer math tricks than his friend. Here is the written expression showing the number of tricks Marvin knows. 30 less than x a) b) Which is correct? Lets go back to our basics to figure it out… Agenda 10

Explore –Marvin's Math: Part 2 1. What is 30 less than 50? 20 2. What is 30 less than 72? 42 3. What is 30 less than 56? 26 50 - 30 72 - 30 56 - 30 4. What is 30 less than x? x - 30 What did you do to get your answer? Turn and Talk: When you see “less than” in a written expression, what is important? Agenda 11

Explore –Marvin's Math: Part 2 Marvin knows 30 fewer math tricks than his friend. Here is the written expression showing the number of tricks Marvin knows. 30 less than x r e w s n a) A ct e r r Co b) Agenda 12

Practice- Class Work Name_________ Date______ Class Work Lesson 4 1) Directions: Write an algebraic expression for each. Let’s do the first one together. a) five less than three times a number b) eight less than the quotient of a number and two c) nine times the sum of a number and fifteen d) The sum of twice a number and seven e) one plus the product of a number and five f) A number less than twenty five g) The sum of half a number and four h) seven less than a third of the sum of a number and two 2) Directions: Write two written expression for each. Use the key vocabulary. a) b) Agenda 13

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

Practice- Class Work Summary Name_________ Date______ Class Work Lesson 4 1) Directions: Write an algebraic expression for each. b) Eight less than the quotient of a number and two c) Nine times the sum of a number and fifteen d) The sum of twice a number and seven f) A number less than twenty five e) One plus the product of a number and five h) Seven less than a third of the sum of a g) The sum of half a number and four number and two a) Five less than three times a number 2) Directions: Write two written expression for each. Use the key vocabulary. a) b) c) d) e) f) g) Agenda 15

Assessment-Exit Slip 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. A number less than nine 3) Write an algebraic expression for Ten less than the sum of a six and a number Agenda 30