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. $1900 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$1900 · 7% · 4 · Simple interest & savings
2. $1900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$1900 · 10% · 4 · Simple interest & savings
3. $1500 is invested at 4% simple interest per year for 1 year. How much simple interest is earned?
$1500 · 4% · 1 · Simple interest & savings
4. $1700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$1700 · 9% · 3 · Simple interest & savings
5. $700 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$700 · 8% · 3 · Simple interest & savings
6. $1500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$1500 · 3% · 6 · Simple interest & savings
7. $1400 is invested at 7% simple interest per year for 1 year. How much simple interest is earned?
$1400 · 7% · 1 · Simple interest & savings
8. $600 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$600 · 3% · 4 · Simple interest & savings
9. $300 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$300 · 6% · 2 · Simple interest & savings
10. $1000 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$1000 · 3% · 5 · 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. $1000 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$1000 · 9% · 6 · Simple interest & savings

12 questions · Seed 104738 · 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. $1900 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$532
Simple interest I = P × r × t = $1900 × 7% × 4 = $532.
2. $1900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$760
Simple interest I = P × r × t = $1900 × 10% × 4 = $760.
3. $1500 is invested at 4% simple interest per year for 1 year. How much simple interest is earned?
$60
Simple interest I = P × r × t = $1500 × 4% × 1 = $60.
4. $1700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$459
Simple interest I = P × r × t = $1700 × 9% × 3 = $459.
5. $700 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$168
Simple interest I = P × r × t = $700 × 8% × 3 = $168.
6. $1500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $1500 × 3% × 6 = $270.
7. $1400 is invested at 7% simple interest per year for 1 year. How much simple interest is earned?
$98
Simple interest I = P × r × t = $1400 × 7% × 1 = $98.
8. $600 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$72
Simple interest I = P × r × t = $600 × 3% × 4 = $72.
9. $300 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$36
Simple interest I = P × r × t = $300 × 6% × 2 = $36.
10. $1000 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$150
Simple interest I = P × r × t = $1000 × 3% × 5 = $150.
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. $1000 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$540
Simple interest I = P × r × t = $1000 × 9% × 6 = $540.

12 questions · Seed 104738 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $1900 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$1900 · 7% · 4 · Simple interest & savings
2. $1900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$1900 · 10% · 4 · Simple interest & savings
3. $1500 is invested at 4% simple interest per year for 1 year. How much simple interest is earned?
$1500 · 4% · 1 · Simple interest & savings
4. $1700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$1700 · 9% · 3 · Simple interest & savings
5. $700 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$700 · 8% · 3 · Simple interest & savings
6. $1500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$1500 · 3% · 6 · Simple interest & savings
7. $1400 is invested at 7% simple interest per year for 1 year. How much simple interest is earned?
$1400 · 7% · 1 · Simple interest & savings
8. $600 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$600 · 3% · 4 · Simple interest & savings
9. $300 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$300 · 6% · 2 · Simple interest & savings
10. $1000 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$1000 · 3% · 5 · 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. $1000 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$1000 · 9% · 6 · Simple interest & savings

12 questions · Seed 104738 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $1900 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$532
Simple interest I = P × r × t = $1900 × 7% × 4 = $532.
2. $1900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$760
Simple interest I = P × r × t = $1900 × 10% × 4 = $760.
3. $1500 is invested at 4% simple interest per year for 1 year. How much simple interest is earned?
$60
Simple interest I = P × r × t = $1500 × 4% × 1 = $60.
4. $1700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$459
Simple interest I = P × r × t = $1700 × 9% × 3 = $459.
5. $700 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$168
Simple interest I = P × r × t = $700 × 8% × 3 = $168.
6. $1500 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $1500 × 3% × 6 = $270.
7. $1400 is invested at 7% simple interest per year for 1 year. How much simple interest is earned?
$98
Simple interest I = P × r × t = $1400 × 7% × 1 = $98.
8. $600 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$72
Simple interest I = P × r × t = $600 × 3% × 4 = $72.
9. $300 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$36
Simple interest I = P × r × t = $300 × 6% × 2 = $36.
10. $1000 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$150
Simple interest I = P × r × t = $1000 × 3% × 5 = $150.
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. $1000 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$540
Simple interest I = P × r × t = $1000 × 9% × 6 = $540.

12 questions · Seed 104738 · Age guidance, not curriculum certification