Estimating Products with Decimals

The video tutorial covers estimating and multiplying using decimals and whole numbers. It begins with an introduction to the concepts of rounding and estimation, followed by visual aids and number lines to help students understand how to round numbers to their greatest place value. The tutorial also includes examples of rounding and multiplying larger numbers, and concludes with tricks and tips for effective rounding and estimation.

What is the first step in estimating the product of two numbers?

• Round each number to its greatest place value

• Multiply the numbers directly

• Add the numbers first

• Subtract the smaller number from the larger one

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CCSS.4.NBT.B.5

When rounding 5.9, which place value do we consider?

• Thousandths

• Ones

• Tenths

• Hundredths

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CCSS.5.NBT.A.4

Using a number line, where would 5.9 be closer to?

• 5

• 6

• 5.5

• 4.9

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CCSS.5.NBT.A.4

What is the result of rounding 54 to its greatest place value?

• 45

• 50

• 55

• 60

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

After rounding 5.9 to 6 and 54 to 50, what is the estimated product?

• 400

• 350

• 300

• 250

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CCSS.5.NBT.B.7

What is the greatest place value in the number 10.1?

• Tens

• Ones

• Hundredths

• Tenths

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CCSS.5.NBT.A.3A

When rounding 10.1, which number do we look at to decide if we round up or down?

• 0

• 10

• 11

• 1

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CCSS.5.NBT.A.4

What is the estimated product of 10 and 90?

• 800

• 1100

• 900

• 1000

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CCSS.4.NBT.B.5

Using the rounding trick, what do you do if the digit to the right is 5 or greater?

• Round down

• Keep the number the same

• Round up

• Ignore the digit

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

What is the estimated product of 9 and 20?

• 170

• 160

• 190

• 180

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CCSS.4.NBT.B.5