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. $1800 is invested at 10% simple interest per year for 6 years. How much simple interest is earned?
$1800 · 10% · 6 · Simple interest & savings
2. $500 is invested at 2% simple interest per year for 6 years. How much simple interest is earned?
$500 · 2% · 6 · Simple interest & savings
3. $700 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$700 · 10% · 4 · Simple interest & savings
4. $1900 is invested at 2% simple interest per year for 3 years. How much simple interest is earned?
$1900 · 2% · 3 · Simple interest & savings
5. $900 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$900 · 5% · 6 · Simple interest & savings
6. $1300 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$1300 · 9% · 3 · Simple interest & savings
7. $1800 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1800 · 8% · 1 · Simple interest & savings
8. $1100 is invested at 7% simple interest per year for 2 years. How much simple interest is earned?
$1100 · 7% · 2 · Simple interest & savings
9. $1000 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$1000 · 10% · 3 · Simple interest & savings
10. $1700 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$1700 · 5% · 4 · Simple interest & savings
11. $1100 is invested at 5% simple interest per year for 5 years. How much simple interest is earned?
$1100 · 5% · 5 · Simple interest & savings
12. $400 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$400 · 3% · 4 · Simple interest & savings

12 questions · Seed 104730 · 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. $1800 is invested at 10% simple interest per year for 6 years. How much simple interest is earned?
$1080
Simple interest I = P × r × t = $1800 × 10% × 6 = $1080.
2. $500 is invested at 2% simple interest per year for 6 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $500 × 2% × 6 = $60.
3. $700 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$280
Simple interest I = P × r × t = $700 × 10% × 4 = $280.
4. $1900 is invested at 2% simple interest per year for 3 years. How much simple interest is earned?
$114
Simple interest I = P × r × t = $1900 × 2% × 3 = $114.
5. $900 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $900 × 5% × 6 = $270.
6. $1300 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$351
Simple interest I = P × r × t = $1300 × 9% × 3 = $351.
7. $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.
8. $1100 is invested at 7% simple interest per year for 2 years. How much simple interest is earned?
$154
Simple interest I = P × r × t = $1100 × 7% × 2 = $154.
9. $1000 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$300
Simple interest I = P × r × t = $1000 × 10% × 3 = $300.
10. $1700 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$340
Simple interest I = P × r × t = $1700 × 5% × 4 = $340.
11. $1100 is invested at 5% simple interest per year for 5 years. How much simple interest is earned?
$275
Simple interest I = P × r × t = $1100 × 5% × 5 = $275.
12. $400 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$48
Simple interest I = P × r × t = $400 × 3% × 4 = $48.

12 questions · Seed 104730 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $1800 is invested at 10% simple interest per year for 6 years. How much simple interest is earned?
$1800 · 10% · 6 · Simple interest & savings
2. $500 is invested at 2% simple interest per year for 6 years. How much simple interest is earned?
$500 · 2% · 6 · Simple interest & savings
3. $700 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$700 · 10% · 4 · Simple interest & savings
4. $1900 is invested at 2% simple interest per year for 3 years. How much simple interest is earned?
$1900 · 2% · 3 · Simple interest & savings
5. $900 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$900 · 5% · 6 · Simple interest & savings
6. $1300 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$1300 · 9% · 3 · Simple interest & savings
7. $1800 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1800 · 8% · 1 · Simple interest & savings
8. $1100 is invested at 7% simple interest per year for 2 years. How much simple interest is earned?
$1100 · 7% · 2 · Simple interest & savings
9. $1000 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$1000 · 10% · 3 · Simple interest & savings
10. $1700 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$1700 · 5% · 4 · Simple interest & savings
11. $1100 is invested at 5% simple interest per year for 5 years. How much simple interest is earned?
$1100 · 5% · 5 · Simple interest & savings
12. $400 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$400 · 3% · 4 · Simple interest & savings

12 questions · Seed 104730 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $1800 is invested at 10% simple interest per year for 6 years. How much simple interest is earned?
$1080
Simple interest I = P × r × t = $1800 × 10% × 6 = $1080.
2. $500 is invested at 2% simple interest per year for 6 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $500 × 2% × 6 = $60.
3. $700 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$280
Simple interest I = P × r × t = $700 × 10% × 4 = $280.
4. $1900 is invested at 2% simple interest per year for 3 years. How much simple interest is earned?
$114
Simple interest I = P × r × t = $1900 × 2% × 3 = $114.
5. $900 is invested at 5% simple interest per year for 6 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $900 × 5% × 6 = $270.
6. $1300 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$351
Simple interest I = P × r × t = $1300 × 9% × 3 = $351.
7. $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.
8. $1100 is invested at 7% simple interest per year for 2 years. How much simple interest is earned?
$154
Simple interest I = P × r × t = $1100 × 7% × 2 = $154.
9. $1000 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$300
Simple interest I = P × r × t = $1000 × 10% × 3 = $300.
10. $1700 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$340
Simple interest I = P × r × t = $1700 × 5% × 4 = $340.
11. $1100 is invested at 5% simple interest per year for 5 years. How much simple interest is earned?
$275
Simple interest I = P × r × t = $1100 × 5% × 5 = $275.
12. $400 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$48
Simple interest I = P × r × t = $400 × 3% × 4 = $48.

12 questions · Seed 104730 · Age guidance, not curriculum certification