Exploring Exponential Growth: Tripling Challenges for 8th Graders

A bacteria culture triples in size every hour. If there are initially 5 bacteria, how many will there be after 4 hours?

• 405

• 1000

• 125

• 15

A tree grows in height by tripling its height every year. If the tree is 2 meters tall now, what will its height be after 3 years?

• 36 meters

• 54 meters

• 6 meters

• 18 meters

A certain investment triples in value every 5 years. If you invest $200, how much will it be worth after 15 years?

• 6000

• 3000

• 5400

• 7200

A population of rabbits triples every month. If there are 10 rabbits now, how many will there be after 6 months?

• 5000

• 1000

• 7290

• 15000

A certain type of plant triples its number of leaves every week. If it starts with 3 leaves, how many leaves will it have after 5 weeks?

• 243

• 729

• 27

• 81

A viral video on social media triples its views every day. If it starts with 100 views, how many views will it have after 4 days?

• 5000 views

• 10000 views

• 4000 views

• 8100 views

A savings account triples its balance every 10 years. If you start with $500, how much will you have after 30 years?

• 4500

• 9000

• 27000

• 13500

A certain species of fish triples its population every year. If there are currently 15 fish, how many will there be after 2 years?

• 135

• 45

• 30

• 60

A smartphone app's downloads triple every month. If it has 1,000 downloads now, how many downloads will it have after 3 months?

• 1000

• 15000

• 9000

• 27000

A certain type of mushroom triples in size every week. If it starts at 1 cm, how large will it be after 4 weeks?

• 64 cm

• 100 cm

• 27 cm

• 81 cm