5 Minute Check Complete in your notebook. Estimate each product. 1. 9.7 x 3 2. 3.4 x 5 3. 17.5 x 8 Multiply. 4. 1.5 x 6 5. 3.1 x 13 6. 3.48 x 25.

Name: 5 Minute Check Complete in your notebook. Estimate each product. 1. 9.7 x 3 2. 3.4 x 5 3. 17.5 x 8 Multiply. 4. 1.5 x 6 5. 3.1 x 13 6. 3.48 x 25.
Uploaded: 2017-11-02T13:31:06+00:00
Duration: PTM14S37
Channel: Victor Cunningham
Description: 5 Minute Check Complete in your notebook. Estimate each product. 1. 9.7 x 3 2. 3.4 x 5 3. 17.5 x 8 Multiply. 4. 1.5 x 6 5. 3.1 x 13 6. 3.48 x 25.

5 Minute Check Complete in your notebook. Estimate each product x x x 8 Multiply x x x 25

5 Minute Check Complete in your notebook. Estimate each product x 3

5 Minute Check Complete in your notebook. Estimate each product x 3 10 x 3 = 30

5 Minute Check Complete in your notebook. Multiply x 6

5 Minute Check Complete in your notebook. Multiply x decimal place x decimal place

5 Minute Check Complete in your notebook. Multiply x decimal place x 1 3 Don’t forget the zero decimal place

5 Minute Check Complete in your notebook. Multiply x decimal places x 25 Don’t forget the zero decimal places

Flashcards!

Lesson 3.2 and 3.4 Multiplying Decimals by Decimals
Wednesday, Oct 9 Lesson 3.2 and 3.4 Multiplying Decimals by Decimals

Multiplying Decimals by Decimals
Objective: To understand how to estimate and multiply decimals by decimals.

At the end of this lesson you should be able to answer the following questions. How do you determine which place value to use when multiplying decimals by decimals? Why is estimating not as helpful when multiplying very small numbers?

To multiply decimals, multiply as normal and then place the decimal point.

Find the product of 8.7 and 2.8. First round the numbers to the nearest whole number to get an estimate. What does 8.7 round to? Digits from 0 to 4 round down and digits from 5-9 round up.

Find the product of 8.7 and 2.8. First round the numbers to the nearest whole number to get an estimate. What does 8.7 round to? 9 What does 2.8 round to?

Find the product of 8.7 and 2.8. First round the numbers to the nearest whole number to get an estimate. What does 8.7 round to? 9 What does 2.8 round to? 3

Find the product of 8.7 and 2.8. First round the numbers to the nearest whole number to get an estimate. 9 x 3 = 27, so 8.7 x 2.8 ≈ 27

Find the product of 8.7 and 2.8. To multiply decimals. Step 1 – Stack the numbers with the number with the most digits on top. 8.7 x 2.8 (Since both numbers have 2 digits, either could be on top)

Find the product of 8.7 and 2.8. To multiply decimals. Step 2 – Multiply the digits. 8.7 x Don’t forget to add the zero

Find the product of 8.7 and 2.8. To multiply decimals. Step 3 – Determine the number of decimal places in the factors to locate the decimal place in the product decimal place x decimal place decimal places

Find the product of 8.7 and x Is this a reasonable answer?

Find the product of 8.7 and 2.8. Is this a reasonable answer? ≈ 27

Find the product of .98 and 7.3 Estimate?

Find the product of .98 and 7.3 Estimate? 1 x 7 = 7, so .98 x 7.3 ≈ 7 Next?

Find the product of .98 and x 7.3 Next?

Find the product of .98 and x Don’t forget to add a zero Next?

Find the product of .98 and decimal places x decimal place decimal places Is this a reasonable answer?

Find the product of .98 and decimal places x decimal place decimal places Is this a reasonable answer? ≈ 7

Find the product of 3.6 and Estimate?

Find the product of 3.6 and x 0 = 0, so 3.6 x 0.05 ≈ 0

Find the product of 3.6 and x 0 = 4, so 3.6 x 0.05 ≈ 0 Actual product?

Find the product of 3.6 and decimal places x decimal place decimal places Is this a reasonable answer?

Find the product of 3.6 and decimal places x decimal place decimal places Is this a reasonable answer? ≈ 0

Find the product of and 7.2 Estimate?

Find the product of and 7.2 Estimate? 0 x 7 = 0, so x 7.2 ≈ 0 Actual product?

Find the product of and decimal places x decimal place decimal places Is this a reasonable answer?

Find the product of and decimal places x decimal place decimal places Is this a reasonable answer? ≈ 0

Find the product of 1.4 and Estimate?

Find the product of 1.4 and Estimate? 1 x 0 = x ≈ 0 Actual product?

Find the product of 1.4 and decimal places x decimal place decimal places Is this a reasonable answer?

Find the product of 1.4 and decimal places x decimal place decimal places Is this a reasonable answer? ≈ 0

Mr. Avery’s car can travel miles on one gallon of gas. If his gas tank holds 11.5 gallons, how far can he travel on one tank? Estimate?

Mr. Avery’s car can travel miles on one gallon of gas. If his gas tank holds 11.5 gallons, how far can he travel on one tank? Estimate? 28 x 12 = 336 Keep in mind 28 x 12 = 28 x x 2 = = 336 Actual product?

Mr. Avery’s car can travel miles on one gallon of gas. If his gas tank holds 11.5 gallons, how far can he travel on one tank? decimal places x decimal place decimal places Is this a reasonable answer?

Mr. Avery’s car can travel miles on one gallon of gas. If his gas tank holds 11.5 gallons, how far can he travel on one tank? decimal places x decimal place decimal places Is this a reasonable answer? ≈ 336

Determine whether the following statement is always, sometimes or never true. The product of two decimals less than 1 is less than either of the factors. Give examples to support your answer.

Determine whether the following statement is always, sometimes or never true. The product of two decimals less than 1 is less than either of the factors. Always. 0.3 x 0.5 = .15, which is less than 0.3 and x 0.6 = 0.45

Complete the Mid-Chapter Check on page 214. When complete bring to the desk and show Mr. Avery. Agenda Notes Homework –Homework Practice 3-2/3-4 Due Thursday, Oct 10 Mid-Chapter 3 Quiz –Thursday, Oct 10

5 Minute Check Complete in your notebook. Estimate each product. 1. 9.7 x 3 2. 3.4 x 5 3. 17.5 x 8 Multiply. 4. 1.5 x 6 5. 3.1 x 13 6. 3.48 x 25.

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5 Minute Check Complete in your notebook. Estimate each product. 1. 9.7 x 3 2. 3.4 x 5 3. 17.5 x 8 Multiply. 4. 1.5 x 6 5. 3.1 x 13 6. 3.48 x 25.

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Presentation on theme: "5 Minute Check Complete in your notebook. Estimate each product. 1. 9.7 x 3 2. 3.4 x 5 3. 17.5 x 8 Multiply. 4. 1.5 x 6 5. 3.1 x 13 6. 3.48 x 25."— Presentation transcript:

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