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Money · Ages 10+ · Set B
The rule of 72
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Goal: 15 min
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Remember: Seventy-two divided by the yearly rate is a quick guess at the years to double.

Questions

1
Seventy-two divided by the rate is about the years to double. Which garden doubles in about eight years?
🐕a garden paying six percent🦌a garden paying nine percent🐆a garden paying twelve percent
2
🚀Seventy-two divided by the rate is about the years to double. Does a garden paying twenty-four percent double in about four years?
YesNo
3
Which one is not true about the rule of seventy-two?
💭a tool for thinking≈an approximation🔭just as good at any rate
4
Which one is true about the rule of seventy-two?
💭a tool for thinking📏exact every single time🤞a promise about a real garden
5
Which one is not true about the rule of seventy-two?
🎯a close guess at doubling time🧮counting every year by hand💭a tool for thinking
6
Seventy-two divided by the rate is about the years to double. Which garden doubles in about eighteen years?
🦎a garden paying four percent🐢a garden paying three percent🐕a garden paying six percent
7
Which one is true about the rule of seventy-two?
🔭just as good at any rate📏exact every single time🎯a close guess at doubling time
8
Seventy-two divided by the rate is about the years to double. Which garden doubles in about twelve years?
🚀a garden paying twenty-four percent🐎a garden paying eight percent🐕a garden paying six percent
9
≈Is an approximation true of the rule of seventy-two?
YesNo
10
🐢Seventy-two divided by the rate is about the years to double. Does a garden paying three percent double in about nine years?
YesNo
11
Which one is true about the rule of seventy-two?
📏exact every single time🧮counting every year by hand➗seventy-two splitting evenly many ways
12
🐆Seventy-two divided by the rate is about the years to double. Does a garden paying twelve percent double in about four years?
YesNo
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Answer key · Set B
The rule of 72
1a garden paying nine percent
2No
3just as good at any rate
4a tool for thinking
5counting every year by hand
6a garden paying four percent
7a close guess at doubling time
8a garden paying six percent
9Yes
10No
11seventy-two splitting evenly many ways
12No
Mark each answer, count the right ones and write the score on the sheet.