## 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 included if something is measured.

Example 2: Writing and Evaluating Addition and Subtraction Expressions

Read 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.

Answer:

### Eureka Math Grade 6 Module 4 Lesson 18 Exercise Answer Key

Exercise 1.

Read the variable in the table, and improve the description given, making it more specific.

Answer:

Answers may vary because students may choose a different unit.

Exercise 2.

Read each variable in the table, and improve the description given, making it more specific.

Answer:

### Eureka Math Grade 6 Module 4 Lesson 18 Problem Set Answer Key

Question 1.

Read 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.

Answer:

Sample answers are shown. An additional expression can be written for each.

Question 2.

If George went camping 15 times, how could you figure out how many times Dave went camping?

Answer:

Adding 3 to George’s camping trip total (15) would yield an answer of 18 trips for Dave.

### Eureka Math Grade 6 Module 4 Lesson 18 Exit Ticket Answer Key

Kathleen lost a tooth today. Now she has lost 4 more than her sister Cara lost.

Question 1.

Write an expression to represent the number of teeth Cara has lost. Let K represent the number of teeth Kathleen lost.

Answer:

Expression: K – 4

Question 2.

Write an expression to represent the number of teeth Kathleen lost. Let C represent the number of teeth Cara lost.

Answer:

Expression: C + 4

Question 3.

If Cara lost 3 teeth, how many teeth has Kathleen lost

Answer:

C + 4; 3 + 4; Kathleen has lost 7 teeth.

### Eureka Math Grade 6 Module 4 Lesson 18 Opening Exercise Answer Key

How can we show a number increased by 2?

Answer:

a + 2 or 2 + a

Can you prove this using a model?

Answer:

Yes. I can use a tape diagram.