\nRead each story problem. Identify the unknown quantity, and write the addition or subtraction expression that is described. Finally, evaluate your expression using the information given in column four.
\n
![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Example-Answer-Key-2.png\")
\n
![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Example-Answer-Key-3.png\")
\nAnswer:
\n
![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Example-Answer-Key-4.png\")
<\/p>\nExample 1. The Importance of Being Specific in Naming Variables
\nWhen naming variables in expressions, it is important to be very clear about what they represent. The units of measure must be included if something is measured.<\/p>\n
Example 2: Writing and Evaluating Addition and Subtraction Expressions
\nRead each story problem. Identify the unknown quantity, and write the addition or subtraction expression that is described. Finally, evaluate your expression using the information given in column four.
\n
\n
\nAnswer:
\n<\/p>\n
Exercise 1.
\nRead the variable in the table, and improve the description given, making it more specific.
\n![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Exercise-Answer-Key-5.png\")
\nAnswer:
\nAnswers may vary because students may choose a different unit.
\n![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Exercise-Answer-Key-6.png\")
<\/p>\n
Exercise 2.
\nRead each variable in the table, and improve the description given, making it more specific.
\n![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Exercise-Answer-Key-7.png\")
\nAnswer:
\n![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Exercise-Answer-Key-8.png\")
<\/p>\n
Question 1.
\nRead each story problem. Identify the unknown quantity, and write the addition or subtraction expression that is described. Finally, evaluate your expression using the information given in column four.
\n![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Problem-Set-Answer-Key-9.png\")
\nAnswer:
\nSample answers are shown. An additional expression can be written for each.
\n![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Problem-Set-Answer-Key-10.png\")
<\/p>\n
Question 2.
\nIf George went camping 15 times, how could you figure out how many times Dave went camping?
\nAnswer:
\nAdding 3 to George\u2019s camping trip total (15) would yield an answer of 18 trips for Dave.<\/p>\n
Kathleen lost a tooth today. Now she has lost 4 more than her sister Cara lost.<\/p>\n
Question 1.
\nWrite an expression to represent the number of teeth Cara has lost. Let K represent the number of teeth Kathleen lost.
\nAnswer:
\nExpression: K – 4<\/p>\n
Question 2.
\nWrite an expression to represent the number of teeth Kathleen lost. Let C represent the number of teeth Cara lost.
\nAnswer:
\nExpression: C + 4<\/p>\n
Question 3.
\nIf Cara lost 3 teeth, how many teeth has Kathleen lost
\nAnswer:
\nC + 4; 3 + 4; Kathleen has lost 7 teeth.<\/p>\n
How can we show a number increased by 2?
\nAnswer:
\na + 2 or 2 + a<\/p>\n
Can you prove this using a model?
\nAnswer:
\nYes. I can use a tape diagram.
\n![\"Eureka](\"https:\/\/ccssanswers.com\/wp-content\/uploads\/2021\/04\/Eureka-Math-Grade-6-Module-4-Lesson-18-Opening-Exercise-Answer-Key-1.png\")
<\/p>\n","protected":false},"excerpt":{"rendered":"
Engage NY Eureka Math 6th Grade Module 4 Lesson 18 Answer Key Eureka Math Grade 6 Module 4 Lesson 18 Example Answer Key Example 1. The Importance of Being Specific in Naming Variables When naming variables in expressions, it is important to be very clear about what they represent. The units of measure must be … Read more<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/posts\/87469"}],"collection":[{"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/comments?post=87469"}],"version-history":[{"count":1,"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/posts\/87469\/revisions"}],"predecessor-version":[{"id":137117,"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/posts\/87469\/revisions\/137117"}],"wp:attachment":[{"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/media?parent=87469"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/categories?post=87469"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ccssanswers.com\/wp-json\/wp\/v2\/tags?post=87469"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}