Lesson 1-6 Guide to Solving Number Stories Overview: Students practice solving multistep number stories involving addition and subtraction. Vocabulary – Number Model and Unknown Quantity

Math Message Read the math message in your math journal on page 13. Be ready to explain what you already know from the problem and what the problem wants you to find out.

Located in the United Arab Emirates Burj Khalifa 163 Stories Located in the United Arab Emirates

Petronas Towers Located in the Malaysia 88 Stories

Zifeng Tower in China

Let’s look at page 26 in our Student Reference Book What do you know from reading the story? What do you want to find out? How can you find the number of stories Terrell needs to climb? What will you do first? What strategy or tool can you use (for example, a pattern, diagram, number model, etc)?

You can write number models and use letters to stand for the unknown quantity. What is the unknown quantity? Let’s say that “s” stands for the number of stories in the three buildings. What number model might we write, using a letter to stand for the unknown, to represent what we want to find out? Are you finished? Why or why not? Now let’s say that “n” stands for the number of stories Terrell still needs to climb. What number model could we write, using a letter to stand for the unknown to represent what we want to find out? What is a good estimate for the answer. What can you do if you get stuck?

Column Addition 2 2

Column Addition

Partial-Sums Addition

Trade-First Subtraction

How do you know whether your answer is reasonable? Does your answer make sense?

Practice Math Journal page 13-14 Work in groups or 2 or 3 or independent 25 minutes

Remember to reference page 26 in your student reference book. Exit Ticket List two (2) things you do when solving a number story. Remember to reference page 26 in your student reference book.