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. $700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$700 · 9% · 3 · Simple interest & savings
2. $1000 is invested at 6% simple interest per year for 1 year. How much simple interest is earned?
$1000 · 6% · 1 · Simple interest & savings
3. $1000 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$1000 · 2% · 5 · Simple interest & savings
4. $700 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$700 · 2% · 4 · Simple interest & savings
5. $1600 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$1600 · 4% · 2 · Simple interest & savings
6. $700 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$700 · 3% · 4 · Simple interest & savings
7. $2000 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$2000 · 8% · 3 · Simple interest & savings
8. $1800 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$1800 · 3% · 5 · Simple interest & savings
9. $500 is invested at 9% simple interest per year for 2 years. How much simple interest is earned?
$500 · 9% · 2 · Simple interest & savings
10. $500 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$500 · 7% · 3 · Simple interest & savings
11. $400 is invested at 4% simple interest per year for 5 years. How much simple interest is earned?
$400 · 4% · 5 · Simple interest & savings
12. $500 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$500 · 3% · 4 · Simple interest & savings

12 questions · Seed 42 · 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. $700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$189
Simple interest I = P × r × t = $700 × 9% × 3 = $189.
2. $1000 is invested at 6% simple interest per year for 1 year. How much simple interest is earned?
$60
Simple interest I = P × r × t = $1000 × 6% × 1 = $60.
3. $1000 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$100
Simple interest I = P × r × t = $1000 × 2% × 5 = $100.
4. $700 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$56
Simple interest I = P × r × t = $700 × 2% × 4 = $56.
5. $1600 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$128
Simple interest I = P × r × t = $1600 × 4% × 2 = $128.
6. $700 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$84
Simple interest I = P × r × t = $700 × 3% × 4 = $84.
7. $2000 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$480
Simple interest I = P × r × t = $2000 × 8% × 3 = $480.
8. $1800 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $1800 × 3% × 5 = $270.
9. $500 is invested at 9% simple interest per year for 2 years. How much simple interest is earned?
$90
Simple interest I = P × r × t = $500 × 9% × 2 = $90.
10. $500 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$105
Simple interest I = P × r × t = $500 × 7% × 3 = $105.
11. $400 is invested at 4% simple interest per year for 5 years. How much simple interest is earned?
$80
Simple interest I = P × r × t = $400 × 4% × 5 = $80.
12. $500 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $500 × 3% × 4 = $60.

12 questions · Seed 42 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$700 · 9% · 3 · Simple interest & savings
2. $1000 is invested at 6% simple interest per year for 1 year. How much simple interest is earned?
$1000 · 6% · 1 · Simple interest & savings
3. $1000 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$1000 · 2% · 5 · Simple interest & savings
4. $700 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$700 · 2% · 4 · Simple interest & savings
5. $1600 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$1600 · 4% · 2 · Simple interest & savings
6. $700 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$700 · 3% · 4 · Simple interest & savings
7. $2000 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$2000 · 8% · 3 · Simple interest & savings
8. $1800 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$1800 · 3% · 5 · Simple interest & savings
9. $500 is invested at 9% simple interest per year for 2 years. How much simple interest is earned?
$500 · 9% · 2 · Simple interest & savings
10. $500 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$500 · 7% · 3 · Simple interest & savings
11. $400 is invested at 4% simple interest per year for 5 years. How much simple interest is earned?
$400 · 4% · 5 · Simple interest & savings
12. $500 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$500 · 3% · 4 · Simple interest & savings

12 questions · Seed 42 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$189
Simple interest I = P × r × t = $700 × 9% × 3 = $189.
2. $1000 is invested at 6% simple interest per year for 1 year. How much simple interest is earned?
$60
Simple interest I = P × r × t = $1000 × 6% × 1 = $60.
3. $1000 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$100
Simple interest I = P × r × t = $1000 × 2% × 5 = $100.
4. $700 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$56
Simple interest I = P × r × t = $700 × 2% × 4 = $56.
5. $1600 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$128
Simple interest I = P × r × t = $1600 × 4% × 2 = $128.
6. $700 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$84
Simple interest I = P × r × t = $700 × 3% × 4 = $84.
7. $2000 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$480
Simple interest I = P × r × t = $2000 × 8% × 3 = $480.
8. $1800 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $1800 × 3% × 5 = $270.
9. $500 is invested at 9% simple interest per year for 2 years. How much simple interest is earned?
$90
Simple interest I = P × r × t = $500 × 9% × 2 = $90.
10. $500 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$105
Simple interest I = P × r × t = $500 × 7% × 3 = $105.
11. $400 is invested at 4% simple interest per year for 5 years. How much simple interest is earned?
$80
Simple interest I = P × r × t = $400 × 4% × 5 = $80.
12. $500 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $500 × 3% × 4 = $60.

12 questions · Seed 42 · Age guidance, not curriculum certification