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. $500 is invested at 6% simple interest per year for 4 years. How much simple interest is earned?
$500 · 6% · 4 · Simple interest & savings
2. $300 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$300 · 4% · 2 · Simple interest & savings
3. $1600 is invested at 8% simple interest per year for 2 years. How much simple interest is earned?
$1600 · 8% · 2 · Simple interest & savings
4. $600 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$600 · 4% · 6 · Simple interest & savings
5. $200 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$200 · 9% · 6 · Simple interest & savings
6. $600 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$600 · 6% · 2 · Simple interest & savings
7. $1400 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$1400 · 9% · 6 · Simple interest & savings
8. $700 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$700 · 5% · 6 · Simple interest & savings
9. $1800 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1800 · 8% · 1 · Simple interest & savings
10. $1500 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$1500 · 2% · 1 · Simple interest & savings
11. $1400 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$1400 · 7% · 3 · Simple interest & savings
12. $1200 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$1200 · 2% · 5 · Simple interest & savings

12 questions · Seed 45 · 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. $500 is invested at 6% simple interest per year for 4 years. How much simple interest is earned?
$120
Simple interest I = P × r × t = $500 × 6% × 4 = $120.
2. $300 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$24
Simple interest I = P × r × t = $300 × 4% × 2 = $24.
3. $1600 is invested at 8% simple interest per year for 2 years. How much simple interest is earned?
$256
Simple interest I = P × r × t = $1600 × 8% × 2 = $256.
4. $600 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$144
Simple interest I = P × r × t = $600 × 4% × 6 = $144.
5. $200 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$108
Simple interest I = P × r × t = $200 × 9% × 6 = $108.
6. $600 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$72
Simple interest I = P × r × t = $600 × 6% × 2 = $72.
7. $1400 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$756
Simple interest I = P × r × t = $1400 × 9% × 6 = $756.
8. $700 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$210
Simple interest I = P × r × t = $700 × 5% × 6 = $210.
9. $1800 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$144
Simple interest I = P × r × t = $1800 × 8% × 1 = $144.
10. $1500 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$30
Simple interest I = P × r × t = $1500 × 2% × 1 = $30.
11. $1400 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$294
Simple interest I = P × r × t = $1400 × 7% × 3 = $294.
12. $1200 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$120
Simple interest I = P × r × t = $1200 × 2% × 5 = $120.

12 questions · Seed 45 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $500 is invested at 6% simple interest per year for 4 years. How much simple interest is earned?
$500 · 6% · 4 · Simple interest & savings
2. $300 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$300 · 4% · 2 · Simple interest & savings
3. $1600 is invested at 8% simple interest per year for 2 years. How much simple interest is earned?
$1600 · 8% · 2 · Simple interest & savings
4. $600 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$600 · 4% · 6 · Simple interest & savings
5. $200 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$200 · 9% · 6 · Simple interest & savings
6. $600 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$600 · 6% · 2 · Simple interest & savings
7. $1400 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$1400 · 9% · 6 · Simple interest & savings
8. $700 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$700 · 5% · 6 · Simple interest & savings
9. $1800 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1800 · 8% · 1 · Simple interest & savings
10. $1500 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$1500 · 2% · 1 · Simple interest & savings
11. $1400 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$1400 · 7% · 3 · Simple interest & savings
12. $1200 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$1200 · 2% · 5 · Simple interest & savings

12 questions · Seed 45 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $500 is invested at 6% simple interest per year for 4 years. How much simple interest is earned?
$120
Simple interest I = P × r × t = $500 × 6% × 4 = $120.
2. $300 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$24
Simple interest I = P × r × t = $300 × 4% × 2 = $24.
3. $1600 is invested at 8% simple interest per year for 2 years. How much simple interest is earned?
$256
Simple interest I = P × r × t = $1600 × 8% × 2 = $256.
4. $600 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$144
Simple interest I = P × r × t = $600 × 4% × 6 = $144.
5. $200 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$108
Simple interest I = P × r × t = $200 × 9% × 6 = $108.
6. $600 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$72
Simple interest I = P × r × t = $600 × 6% × 2 = $72.
7. $1400 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$756
Simple interest I = P × r × t = $1400 × 9% × 6 = $756.
8. $700 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$210
Simple interest I = P × r × t = $700 × 5% × 6 = $210.
9. $1800 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$144
Simple interest I = P × r × t = $1800 × 8% × 1 = $144.
10. $1500 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$30
Simple interest I = P × r × t = $1500 × 2% × 1 = $30.
11. $1400 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$294
Simple interest I = P × r × t = $1400 × 7% × 3 = $294.
12. $1200 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$120
Simple interest I = P × r × t = $1200 × 2% × 5 = $120.

12 questions · Seed 45 · Age guidance, not curriculum certification