Time & moneyAges 13-15

Simple interest & savings

Use I = Prt to calculate simple interest earned on a principal sum over a number of years. Review suitability for your learners before teaching.

New variation Try interactive challenge Browse templates

Age band:Ages 13-15 Ages 16-18

Choose “Save as PDF” to keep a copy. Use your browser’s paper setting for A4 or Letter.

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $2000 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$2000 · 5% · 4 · Simple interest & savings
2. $600 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$600 · 8% · 3 · Simple interest & savings
3. $1500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$1500 · 3% · 6 · Simple interest & savings
4. $800 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$800 · 2% · 4 · Simple interest & savings
5. $1600 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$1600 · 8% · 3 · Simple interest & savings
6. $1300 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$1300 · 5% · 6 · Simple interest & savings
7. $800 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$800 · 10% · 3 · Simple interest & savings
8. $700 is invested at 2% simple interest per year for 6 years. How much simple interest is earned?
$700 · 2% · 6 · Simple interest & savings
9. $1700 is invested at 4% simple interest per year for 1 year. How much simple interest is earned?
$1700 · 4% · 1 · Simple interest & savings
10. $400 is invested at 10% simple interest per year for 5 years. How much simple interest is earned?
$400 · 10% · 5 · Simple interest & savings
11. $500 is invested at 3% simple interest per year for 2 years. How much simple interest is earned?
$500 · 3% · 2 · Simple interest & savings
12. $200 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$200 · 7% · 4 · Simple interest & savings

12 questions · Seed 104745 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $2000 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$400
Simple interest I = P × r × t = $2000 × 5% × 4 = $400.
2. $600 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$144
Simple interest I = P × r × t = $600 × 8% × 3 = $144.
3. $1500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $1500 × 3% × 6 = $270.
4. $800 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$64
Simple interest I = P × r × t = $800 × 2% × 4 = $64.
5. $1600 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$384
Simple interest I = P × r × t = $1600 × 8% × 3 = $384.
6. $1300 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$390
Simple interest I = P × r × t = $1300 × 5% × 6 = $390.
7. $800 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$240
Simple interest I = P × r × t = $800 × 10% × 3 = $240.
8. $700 is invested at 2% simple interest per year for 6 years. How much simple interest is earned?
$84
Simple interest I = P × r × t = $700 × 2% × 6 = $84.
9. $1700 is invested at 4% simple interest per year for 1 year. How much simple interest is earned?
$68
Simple interest I = P × r × t = $1700 × 4% × 1 = $68.
10. $400 is invested at 10% simple interest per year for 5 years. How much simple interest is earned?
$200
Simple interest I = P × r × t = $400 × 10% × 5 = $200.
11. $500 is invested at 3% simple interest per year for 2 years. How much simple interest is earned?
$30
Simple interest I = P × r × t = $500 × 3% × 2 = $30.
12. $200 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$56
Simple interest I = P × r × t = $200 × 7% × 4 = $56.

12 questions · Seed 104745 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $2000 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$2000 · 5% · 4 · Simple interest & savings
2. $600 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$600 · 8% · 3 · Simple interest & savings
3. $1500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$1500 · 3% · 6 · Simple interest & savings
4. $800 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$800 · 2% · 4 · Simple interest & savings
5. $1600 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$1600 · 8% · 3 · Simple interest & savings
6. $1300 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$1300 · 5% · 6 · Simple interest & savings
7. $800 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$800 · 10% · 3 · Simple interest & savings
8. $700 is invested at 2% simple interest per year for 6 years. How much simple interest is earned?
$700 · 2% · 6 · Simple interest & savings
9. $1700 is invested at 4% simple interest per year for 1 year. How much simple interest is earned?
$1700 · 4% · 1 · Simple interest & savings
10. $400 is invested at 10% simple interest per year for 5 years. How much simple interest is earned?
$400 · 10% · 5 · Simple interest & savings
11. $500 is invested at 3% simple interest per year for 2 years. How much simple interest is earned?
$500 · 3% · 2 · Simple interest & savings
12. $200 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$200 · 7% · 4 · Simple interest & savings

12 questions · Seed 104745 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $2000 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$400
Simple interest I = P × r × t = $2000 × 5% × 4 = $400.
2. $600 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$144
Simple interest I = P × r × t = $600 × 8% × 3 = $144.
3. $1500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $1500 × 3% × 6 = $270.
4. $800 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$64
Simple interest I = P × r × t = $800 × 2% × 4 = $64.
5. $1600 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$384
Simple interest I = P × r × t = $1600 × 8% × 3 = $384.
6. $1300 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$390
Simple interest I = P × r × t = $1300 × 5% × 6 = $390.
7. $800 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$240
Simple interest I = P × r × t = $800 × 10% × 3 = $240.
8. $700 is invested at 2% simple interest per year for 6 years. How much simple interest is earned?
$84
Simple interest I = P × r × t = $700 × 2% × 6 = $84.
9. $1700 is invested at 4% simple interest per year for 1 year. How much simple interest is earned?
$68
Simple interest I = P × r × t = $1700 × 4% × 1 = $68.
10. $400 is invested at 10% simple interest per year for 5 years. How much simple interest is earned?
$200
Simple interest I = P × r × t = $400 × 10% × 5 = $200.
11. $500 is invested at 3% simple interest per year for 2 years. How much simple interest is earned?
$30
Simple interest I = P × r × t = $500 × 3% × 2 = $30.
12. $200 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$56
Simple interest I = P × r × t = $200 × 7% × 4 = $56.

12 questions · Seed 104745 · Age guidance, not curriculum certification