WorksheetsReal-World Growth & Decay: Word Problems for 8th Graders
Total questions: 10
Worksheet time: 5mins
A population of bacteria doubles every 3 hours. If you start with 500 bacteria, how many will there be after 9 hours?
2000
1000
4000
3000
A car's value decreases by 15% each year. If the car is currently worth $20,000, what will its value be after 2 years?
$14,450
$16,000
$18,500
$17,000
A tree grows at a rate of 5% per year. If the tree is currently 10 feet tall, how tall will it be after 4 years?
10.5 feet
13.0 feet
15.0 feet
12.16 feet
A savings account earns 4% interest compounded annually. If you deposit $1,000, how much will you have in the account after 5 years?
1500.00
1100.00
1000.00
1216.65
A certain species of fish in a lake decreases by 20% each year due to pollution. If there are currently 1,000 fish, how many will be left after 3 years?
800
400
600
512
A town's population is 10,000 and is growing at a rate of 8% per year. What will the population be in 5 years?
12000
15800
13500
14693
A radioactive substance decays at a rate of 25% per hour. If you start with 80 grams, how much will remain after 2 hours?
60 grams
45 grams
30 grams
20 grams
A smartphone loses 30% of its value each year. If it was purchased for $800, what will its value be after 3 years?
680
400
560
274.4
A certain plant species grows exponentially, doubling in size every month. If it starts at 2 inches, how tall will it be after 6 months?
256 inches
128 inches
64 inches
32 inches
A loan of $5,000 has an interest rate of 6% compounded annually. How much will be owed after 3 years?
$5,500.00
$5,955.08
$6,300.00
$4,800.00
