Math 6 Unit 5 Lesson 4

Unit 5 Lesson 4

Adding and Subtracting Decimals with Many Non-Zero Digits

Let's practice adding and subtracting decimals.

• Warm-Up: Activity 4.1

• Practice: Activity 4.2

• Kick it up a notch!: Activity 4.3

• (FA) - Unit 4 Lesson 3 and 4: Adding and Subtracting Decimals

• All starting on page 146!

Warm-Up

Activity 4.1: The Cost of a Photo Print

Open Ended

Here are 3 ways to write a subtraction calculation. What do you notice? What do you wonder?

Multiple Select

Clare bought a photo for 17 cents and paid with a $5 bill. Which way of writing the numbers could Clare use to find the change she should receive?

Fill in the Blanks

Practice!

Activity 4.2: Decimals All Around

Find the value of each expression.

• Remember to line up the decimals.

• Unbundle is necessary

Open Ended

Which methods did you use in the previous question? Why?

Open Ended

In what ways were your methods effective? Was there an expression for which your methods did not work as well as expected?

Mathematician Moment!

Think about what was discussed in the last 2 questions. Was there something mentioned that you had not thought about before?

Take a risk and try a more efficient strategy or one who had not thought about before on these next few problems until you find the most efficient method!

Kick it Up a Notch!

Activity 4.3: Missing Numbers

Think about it!

Access your number sense while working on the next problems.

For example, if you were to subtract 1,000-256, you might have to write it out so that you can borrow.

BUT you could also recognize that 1,000=999+1.

First, find 999-256...you can do that in your head without writing anything down.

999-256=743

Then add 1 to get back to the original 1,000.

1,000-256=999+1-256=999-256+1

1,000-256=744

Write the missing digits in each calculation so that the value of each sum or difference is correct.

• Let's do one together!

• Remember that 10 gets an unbundled!

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Show me what you know!

Complete the Quiz

(FA) Unit 5 Lesson 3 and 4: Adding and Subtracting Decimals

in myMCPS.