Real-Life Exponential Growth: Fun Quiz for 6th Graders

A bacteria culture doubles in size every hour. If you start with 2 bacteria, how many will there be after 5 hours?

• 128

• 32

• 64

• 256

A tree grows 3 times its height every year. If the tree is 2 feet tall now, how tall will it be after 4 years?

• 24 feet

• 162 feet

• 6 feet

• 81 feet

A savings account earns interest that doubles every year. If you deposit $100, how much will you have after 3 years?

• $800

• $300

• $1000

• $600

A certain species of fish can reproduce every 2 months, doubling their population. If there are 10 fish now, how many will there be in 6 months?

• 100

• 20

• 80

• 40

A computer's processing speed doubles every 18 months. If it starts at 1 GHz, what will its speed be after 3 years?

• 1.5 GHz

• 4 GHz

• 2 GHz

• 8 GHz

A viral video gets 4 times more views every day. If it starts with 50 views, how many views will it have after 3 days?

• 800

• 3200

• 1600

• 4000

A plant grows exponentially, increasing its height by a factor of 2 every week. If it is 1 foot tall now, how tall will it be in 5 weeks?

• 4 feet

• 8 feet

• 16 feet

• 32 feet

A city’s population is expected to double every 10 years. If the current population is 20,000, what will it be in 30 years?

• 160000

• 200000

• 80000

• 120000

A smartphone app downloads increase by a factor of 5 every month. If there are 200 downloads now, how many will there be in 2 months?

• 1000

• 2500

• 5000

• 2000

A video game character's power level doubles every level. If the character starts at level 1 with a power of 10, what will the power level be at level 5?

• 200

• 120

• 80

• 160