IM U5 L4 Adding and Subtracting Decimals with Many Non-Zero Digi

Adding and Subtracting Decimals with Many Non-Zero Digits

Lesson 4 Unit 5

Let’s practice adding and subtracting decimals.

Today’s Goals

I can solve problems that involve addition and subtraction of decimals.

Subject | Subject

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Warm-Up pg 35

Open Ended

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

Poll

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

Decimals All Around

Page 36

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Open Ended

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

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

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Open Ended

One micrometer is 1 millionth of a meter. A red blood cell is about 7.5 micrometers in diameter. A coarse grain of sand is about 70 micrometers in diameter. Find the difference between the two diameters in meters. Show your reasoning

Missing Numbers

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Lesson Synthesis

• Which problems did you solve with addition (or subtraction)? How did you know to use addition (or subtraction)?

• How did you find the sums or differences? Why did you chose this method?

• Did you use the same method for all of your problems? Why or why not?

• When subtracting a number with fewer decimal places by another number with more decimal places, such as 2.4 – 0.1587, what strategies might be helpful.

Let's Bring it together

Taller and Farther

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