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. $400 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$400 · 6% · 2 · Simple interest & savings
2. $1000 is invested at 10% simple interest per year for 6 years. How much simple interest is earned?
$1000 · 10% · 6 · Simple interest & savings
3. $1100 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$1100 · 7% · 3 · Simple interest & savings
4. $1700 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$1700 · 4% · 6 · Simple interest & savings
5. $900 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$900 · 8% · 3 · Simple interest & savings
6. $1500 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$1500 · 5% · 4 · Simple interest & savings
7. $400 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$400 · 7% · 4 · Simple interest & savings
8. $300 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$300 · 5% · 4 · Simple interest & savings
9. $900 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$900 · 6% · 2 · Simple interest & savings
10. $300 is invested at 10% simple interest per year for 2 years. How much simple interest is earned?
$300 · 10% · 2 · Simple interest & savings
11. $400 is invested at 4% simple interest per year for 3 years. How much simple interest is earned?
$400 · 4% · 3 · Simple interest & savings
12. $200 is invested at 8% simple interest per year for 2 years. How much simple interest is earned?
$200 · 8% · 2 · Simple interest & savings

12 questions · Seed 49 · 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. $400 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$48
Simple interest I = P × r × t = $400 × 6% × 2 = $48.
2. $1000 is invested at 10% simple interest per year for 6 years. How much simple interest is earned?
$600
Simple interest I = P × r × t = $1000 × 10% × 6 = $600.
3. $1100 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$231
Simple interest I = P × r × t = $1100 × 7% × 3 = $231.
4. $1700 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$408
Simple interest I = P × r × t = $1700 × 4% × 6 = $408.
5. $900 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$216
Simple interest I = P × r × t = $900 × 8% × 3 = $216.
6. $1500 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$300
Simple interest I = P × r × t = $1500 × 5% × 4 = $300.
7. $400 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$112
Simple interest I = P × r × t = $400 × 7% × 4 = $112.
8. $300 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $300 × 5% × 4 = $60.
9. $900 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$108
Simple interest I = P × r × t = $900 × 6% × 2 = $108.
10. $300 is invested at 10% simple interest per year for 2 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $300 × 10% × 2 = $60.
11. $400 is invested at 4% simple interest per year for 3 years. How much simple interest is earned?
$48
Simple interest I = P × r × t = $400 × 4% × 3 = $48.
12. $200 is invested at 8% simple interest per year for 2 years. How much simple interest is earned?
$32
Simple interest I = P × r × t = $200 × 8% × 2 = $32.

12 questions · Seed 49 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $400 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$400 · 6% · 2 · Simple interest & savings
2. $1000 is invested at 10% simple interest per year for 6 years. How much simple interest is earned?
$1000 · 10% · 6 · Simple interest & savings
3. $1100 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$1100 · 7% · 3 · Simple interest & savings
4. $1700 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$1700 · 4% · 6 · Simple interest & savings
5. $900 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$900 · 8% · 3 · Simple interest & savings
6. $1500 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$1500 · 5% · 4 · Simple interest & savings
7. $400 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$400 · 7% · 4 · Simple interest & savings
8. $300 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$300 · 5% · 4 · Simple interest & savings
9. $900 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$900 · 6% · 2 · Simple interest & savings
10. $300 is invested at 10% simple interest per year for 2 years. How much simple interest is earned?
$300 · 10% · 2 · Simple interest & savings
11. $400 is invested at 4% simple interest per year for 3 years. How much simple interest is earned?
$400 · 4% · 3 · Simple interest & savings
12. $200 is invested at 8% simple interest per year for 2 years. How much simple interest is earned?
$200 · 8% · 2 · Simple interest & savings

12 questions · Seed 49 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $400 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$48
Simple interest I = P × r × t = $400 × 6% × 2 = $48.
2. $1000 is invested at 10% simple interest per year for 6 years. How much simple interest is earned?
$600
Simple interest I = P × r × t = $1000 × 10% × 6 = $600.
3. $1100 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$231
Simple interest I = P × r × t = $1100 × 7% × 3 = $231.
4. $1700 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$408
Simple interest I = P × r × t = $1700 × 4% × 6 = $408.
5. $900 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$216
Simple interest I = P × r × t = $900 × 8% × 3 = $216.
6. $1500 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$300
Simple interest I = P × r × t = $1500 × 5% × 4 = $300.
7. $400 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$112
Simple interest I = P × r × t = $400 × 7% × 4 = $112.
8. $300 is invested at 5% simple interest per year for 4 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $300 × 5% × 4 = $60.
9. $900 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$108
Simple interest I = P × r × t = $900 × 6% × 2 = $108.
10. $300 is invested at 10% simple interest per year for 2 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $300 × 10% × 2 = $60.
11. $400 is invested at 4% simple interest per year for 3 years. How much simple interest is earned?
$48
Simple interest I = P × r × t = $400 × 4% × 3 = $48.
12. $200 is invested at 8% simple interest per year for 2 years. How much simple interest is earned?
$32
Simple interest I = P × r × t = $200 × 8% × 2 = $32.

12 questions · Seed 49 · Age guidance, not curriculum certification