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.

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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 1 year. How much simple interest is earned?
$2000 · 5% · 1 · Simple interest & savings
2. $100 is invested at 3% simple interest per year for 2 years. How much simple interest is earned?
$100 · 3% · 2 · Simple interest & savings
3. $700 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$700 · 3% · 5 · Simple interest & savings
4. $1500 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$1500 · 4% · 2 · Simple interest & savings
5. $500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$500 · 3% · 6 · Simple interest & savings
6. $800 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$800 · 4% · 6 · Simple interest & savings
7. $1700 is invested at 6% simple interest per year for 4 years. How much simple interest is earned?
$1700 · 6% · 4 · Simple interest & savings
8. $1100 is invested at 10% simple interest per year for 1 year. How much simple interest is earned?
$1100 · 10% · 1 · Simple interest & savings
9. $700 is invested at 5% simple interest per year for 3 years. How much simple interest is earned?
$700 · 5% · 3 · Simple interest & savings
10. $1800 is invested at 6% simple interest per year for 1 year. How much simple interest is earned?
$1800 · 6% · 1 · Simple interest & savings
11. $1200 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$1200 · 7% · 4 · Simple interest & savings
12. $1000 is invested at 3% simple interest per year for 3 years. How much simple interest is earned?
$1000 · 3% · 3 · Simple interest & savings

12 questions · Seed 48 · 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 1 year. How much simple interest is earned?
$100
Simple interest I = P × r × t = $2000 × 5% × 1 = $100.
2. $100 is invested at 3% simple interest per year for 2 years. How much simple interest is earned?
$6
Simple interest I = P × r × t = $100 × 3% × 2 = $6.
3. $700 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$105
Simple interest I = P × r × t = $700 × 3% × 5 = $105.
4. $1500 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$120
Simple interest I = P × r × t = $1500 × 4% × 2 = $120.
5. $500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$90
Simple interest I = P × r × t = $500 × 3% × 6 = $90.
6. $800 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$192
Simple interest I = P × r × t = $800 × 4% × 6 = $192.
7. $1700 is invested at 6% simple interest per year for 4 years. How much simple interest is earned?
$408
Simple interest I = P × r × t = $1700 × 6% × 4 = $408.
8. $1100 is invested at 10% simple interest per year for 1 year. How much simple interest is earned?
$110
Simple interest I = P × r × t = $1100 × 10% × 1 = $110.
9. $700 is invested at 5% simple interest per year for 3 years. How much simple interest is earned?
$105
Simple interest I = P × r × t = $700 × 5% × 3 = $105.
10. $1800 is invested at 6% simple interest per year for 1 year. How much simple interest is earned?
$108
Simple interest I = P × r × t = $1800 × 6% × 1 = $108.
11. $1200 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$336
Simple interest I = P × r × t = $1200 × 7% × 4 = $336.
12. $1000 is invested at 3% simple interest per year for 3 years. How much simple interest is earned?
$90
Simple interest I = P × r × t = $1000 × 3% × 3 = $90.

12 questions · Seed 48 · 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 1 year. How much simple interest is earned?
$2000 · 5% · 1 · Simple interest & savings
2. $100 is invested at 3% simple interest per year for 2 years. How much simple interest is earned?
$100 · 3% · 2 · Simple interest & savings
3. $700 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$700 · 3% · 5 · Simple interest & savings
4. $1500 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$1500 · 4% · 2 · Simple interest & savings
5. $500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$500 · 3% · 6 · Simple interest & savings
6. $800 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$800 · 4% · 6 · Simple interest & savings
7. $1700 is invested at 6% simple interest per year for 4 years. How much simple interest is earned?
$1700 · 6% · 4 · Simple interest & savings
8. $1100 is invested at 10% simple interest per year for 1 year. How much simple interest is earned?
$1100 · 10% · 1 · Simple interest & savings
9. $700 is invested at 5% simple interest per year for 3 years. How much simple interest is earned?
$700 · 5% · 3 · Simple interest & savings
10. $1800 is invested at 6% simple interest per year for 1 year. How much simple interest is earned?
$1800 · 6% · 1 · Simple interest & savings
11. $1200 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$1200 · 7% · 4 · Simple interest & savings
12. $1000 is invested at 3% simple interest per year for 3 years. How much simple interest is earned?
$1000 · 3% · 3 · Simple interest & savings

12 questions · Seed 48 · 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 1 year. How much simple interest is earned?
$100
Simple interest I = P × r × t = $2000 × 5% × 1 = $100.
2. $100 is invested at 3% simple interest per year for 2 years. How much simple interest is earned?
$6
Simple interest I = P × r × t = $100 × 3% × 2 = $6.
3. $700 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$105
Simple interest I = P × r × t = $700 × 3% × 5 = $105.
4. $1500 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$120
Simple interest I = P × r × t = $1500 × 4% × 2 = $120.
5. $500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$90
Simple interest I = P × r × t = $500 × 3% × 6 = $90.
6. $800 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$192
Simple interest I = P × r × t = $800 × 4% × 6 = $192.
7. $1700 is invested at 6% simple interest per year for 4 years. How much simple interest is earned?
$408
Simple interest I = P × r × t = $1700 × 6% × 4 = $408.
8. $1100 is invested at 10% simple interest per year for 1 year. How much simple interest is earned?
$110
Simple interest I = P × r × t = $1100 × 10% × 1 = $110.
9. $700 is invested at 5% simple interest per year for 3 years. How much simple interest is earned?
$105
Simple interest I = P × r × t = $700 × 5% × 3 = $105.
10. $1800 is invested at 6% simple interest per year for 1 year. How much simple interest is earned?
$108
Simple interest I = P × r × t = $1800 × 6% × 1 = $108.
11. $1200 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$336
Simple interest I = P × r × t = $1200 × 7% × 4 = $336.
12. $1000 is invested at 3% simple interest per year for 3 years. How much simple interest is earned?
$90
Simple interest I = P × r × t = $1000 × 3% × 3 = $90.

12 questions · Seed 48 · Age guidance, not curriculum certification