Rule of 72

Whose responsibility is it to ask for missing work?

• The student's

• The teacher's

Whose responsibility is it to ask for missing work?

• The student's

• The teacher's

What are the factors needed to solve the "Rule of 72"? Check all that apply.

• Rate of Return (ROI)

• Length of Time (e.g. days, months, years)

• Principal (e.g. amount of 💵)

• What type of account (checking, savings)

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CCSS.HSA.CED.A.1

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CCSS.HSA.CED.A.2

Mr. Lyde returns (or interest rate) are 8% a year. How long before his investment doubles?

• 9 years

• 8 years

• 7 years

• Never

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CCSS.HSA.CED.A.1

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Your returns (or interest rate) are 9% a year. How long before your investment doubles?

• 9 years

• 8 years

• 7 years

• They won't

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CCSS.HSF.LE.A.1

CCSS.HSF.LE.A.2

CCSS.HSF.BF.B.5

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Your returns (or interest rate) are 6% a year. How long before your investment doubles?

• 18 years

• 16 years

• 12 years

• 8 years

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CCSS.HSF.LE.A.1

CCSS.HSA.CED.A.1

Mr. Brooks' returns (or interest rate) are 1% a year because they are in a savings account. How long before his savings doubles?

• 72 years

• 36 years

• 1 year

• They will never double

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CCSS.HSF.LE.A.1

CCSS.HSF.LE.A.2

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How many years will it take for Mr. Reynold's $4000 to double with a 5% interest rate?

• 1440

• 14.4

• 55.5

• 80

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CCSS.HSA.CED.A.1

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What calculation should you do to answer the question:

How many years will it take $900 to double if the interest rate is 2%?

• 72 divided by 2

• 900 divided by 2

• 2 divided by 100 times 900

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CCSS.HSF.LE.A.1

CCSS.HSA.CED.A.1

A quick way to estimate how long it takes for your money to double is called...

• rule of 72

• compound interest

• simple interest

• inflation

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CCSS.HSA.CED.A.1

CCSS.HSF.LE.A.2

CCSS.HSF.BF.A.1

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