Subtracting in Scientific Notation

This video tutorial explains how to subtract numbers in scientific notation. It begins with guidelines for ensuring exponents are the same before subtraction. Two examples are provided: one with positive exponents and another with negative exponents. The video demonstrates adjusting exponents, moving decimal points, and performing subtraction to achieve the correct result in scientific notation.

Why is it important for exponents to be the same when subtracting in scientific notation?

• To avoid errors in the final result

• To ensure the coefficients are aligned

• To ensure the numbers are in standard form

• To make the subtraction process easier

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What is the first step if the exponents are not the same when subtracting in scientific notation?

• Add a zero to the smaller number

• Adjust the smaller exponent to match the larger one

• Convert the numbers to standard form

• Subtract the coefficients directly

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How do you adjust the smaller exponent to match the larger one?

• Move the decimal point of the larger number to the right

• Add a zero to the larger number

• Move the decimal point of the smaller number to the left

• Subtract a zero from the smaller number

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CCSS.8.EE.A.4

In the first example, what is the result of subtracting 3.2 x 10^6 and 2.7 x 10^5?

• 2.93 x 10^6

• 3.93 x 10^6

• 0.93 x 10^6

• 1.93 x 10^6

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What happens to the coefficient when you increase the exponent?

• It remains the same

• It becomes larger

• It becomes smaller

• It is divided by 10

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In the second example, why is -3 considered smaller than -2?

• Because -3 is closer to zero

• Because -3 is further left on the number line

• Because -3 has a larger absolute value

• Because -3 is a larger negative number

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CCSS.8.EE.A.4

What is the result of subtracting 8 x 10^-3 from 9 x 10^-2?

• 1.8 x 10^-2

• 2.8 x 10^-2

• 0.8 x 10^-2

• 3.8 x 10^-2

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How do you move the decimal point when adjusting for negative exponents?

• Add a zero to the end

• Subtract a zero from the beginning

• Move it to the left

• Move it to the right

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What is the key takeaway from the video on subtracting in scientific notation?

• Ensure exponents are equal before subtracting

• Always convert to standard form first

• Subtract coefficients directly without adjustment

• Use a calculator for all operations

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What should you do if the result is not in scientific notation after subtraction?

• Convert it back to scientific notation

• Subtract a zero from the result

• Leave it as it is

• Add a zero to the result

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