Time & moneyAges 16-18

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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Age band:Ages 13-15 Ages 16-18

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Worksheet StudioPractice pack · Ages 16-18

Simple interest & savings

Take your time. Show your thinking.

1. $900 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$900 · 2% · 5 · Simple interest & savings
2. $200 is invested at 7% simple interest per year for 6 years. How much simple interest is earned?
$200 · 7% · 6 · Simple interest & savings
3. $100 is invested at 5% simple interest per year for 5 years. How much simple interest is earned?
$100 · 5% · 5 · Simple interest & savings
4. $1900 is invested at 8% simple interest per year for 4 years. How much simple interest is earned?
$1900 · 8% · 4 · Simple interest & savings
5. $900 is invested at 3% simple interest per year for 1 year. How much simple interest is earned?
$900 · 3% · 1 · Simple interest & savings
6. $700 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$700 · 4% · 2 · Simple interest & savings
7. $100 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$100 · 2% · 1 · Simple interest & savings
8. $900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$900 · 10% · 4 · Simple interest & savings
9. $1000 is invested at 4% simple interest per year for 4 years. How much simple interest is earned?
$1000 · 4% · 4 · Simple interest & savings
10. $2000 is invested at 9% simple interest per year for 5 years. How much simple interest is earned?
$2000 · 9% · 5 · Simple interest & savings
11. $200 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$200 · 10% · 3 · Simple interest & savings
12. $1500 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$1500 · 9% · 6 · Simple interest & savings

12 questions · Seed 46 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 16-18

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $900 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$90
Simple interest I = P × r × t = $900 × 2% × 5 = $90.
2. $200 is invested at 7% simple interest per year for 6 years. How much simple interest is earned?
$84
Simple interest I = P × r × t = $200 × 7% × 6 = $84.
3. $100 is invested at 5% simple interest per year for 5 years. How much simple interest is earned?
$25
Simple interest I = P × r × t = $100 × 5% × 5 = $25.
4. $1900 is invested at 8% simple interest per year for 4 years. How much simple interest is earned?
$608
Simple interest I = P × r × t = $1900 × 8% × 4 = $608.
5. $900 is invested at 3% simple interest per year for 1 year. How much simple interest is earned?
$27
Simple interest I = P × r × t = $900 × 3% × 1 = $27.
6. $700 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$56
Simple interest I = P × r × t = $700 × 4% × 2 = $56.
7. $100 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$2
Simple interest I = P × r × t = $100 × 2% × 1 = $2.
8. $900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$360
Simple interest I = P × r × t = $900 × 10% × 4 = $360.
9. $1000 is invested at 4% simple interest per year for 4 years. How much simple interest is earned?
$160
Simple interest I = P × r × t = $1000 × 4% × 4 = $160.
10. $2000 is invested at 9% simple interest per year for 5 years. How much simple interest is earned?
$900
Simple interest I = P × r × t = $2000 × 9% × 5 = $900.
11. $200 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $200 × 10% × 3 = $60.
12. $1500 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$810
Simple interest I = P × r × t = $1500 × 9% × 6 = $810.

12 questions · Seed 46 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 16-18

Simple interest & savings

Take your time. Show your thinking.

1. $900 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$900 · 2% · 5 · Simple interest & savings
2. $200 is invested at 7% simple interest per year for 6 years. How much simple interest is earned?
$200 · 7% · 6 · Simple interest & savings
3. $100 is invested at 5% simple interest per year for 5 years. How much simple interest is earned?
$100 · 5% · 5 · Simple interest & savings
4. $1900 is invested at 8% simple interest per year for 4 years. How much simple interest is earned?
$1900 · 8% · 4 · Simple interest & savings
5. $900 is invested at 3% simple interest per year for 1 year. How much simple interest is earned?
$900 · 3% · 1 · Simple interest & savings
6. $700 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$700 · 4% · 2 · Simple interest & savings
7. $100 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$100 · 2% · 1 · Simple interest & savings
8. $900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$900 · 10% · 4 · Simple interest & savings
9. $1000 is invested at 4% simple interest per year for 4 years. How much simple interest is earned?
$1000 · 4% · 4 · Simple interest & savings
10. $2000 is invested at 9% simple interest per year for 5 years. How much simple interest is earned?
$2000 · 9% · 5 · Simple interest & savings
11. $200 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$200 · 10% · 3 · Simple interest & savings
12. $1500 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$1500 · 9% · 6 · Simple interest & savings

12 questions · Seed 46 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 16-18

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $900 is invested at 2% simple interest per year for 5 years. How much simple interest is earned?
$90
Simple interest I = P × r × t = $900 × 2% × 5 = $90.
2. $200 is invested at 7% simple interest per year for 6 years. How much simple interest is earned?
$84
Simple interest I = P × r × t = $200 × 7% × 6 = $84.
3. $100 is invested at 5% simple interest per year for 5 years. How much simple interest is earned?
$25
Simple interest I = P × r × t = $100 × 5% × 5 = $25.
4. $1900 is invested at 8% simple interest per year for 4 years. How much simple interest is earned?
$608
Simple interest I = P × r × t = $1900 × 8% × 4 = $608.
5. $900 is invested at 3% simple interest per year for 1 year. How much simple interest is earned?
$27
Simple interest I = P × r × t = $900 × 3% × 1 = $27.
6. $700 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$56
Simple interest I = P × r × t = $700 × 4% × 2 = $56.
7. $100 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$2
Simple interest I = P × r × t = $100 × 2% × 1 = $2.
8. $900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$360
Simple interest I = P × r × t = $900 × 10% × 4 = $360.
9. $1000 is invested at 4% simple interest per year for 4 years. How much simple interest is earned?
$160
Simple interest I = P × r × t = $1000 × 4% × 4 = $160.
10. $2000 is invested at 9% simple interest per year for 5 years. How much simple interest is earned?
$900
Simple interest I = P × r × t = $2000 × 9% × 5 = $900.
11. $200 is invested at 10% simple interest per year for 3 years. How much simple interest is earned?
$60
Simple interest I = P × r × t = $200 × 10% × 3 = $60.
12. $1500 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$810
Simple interest I = P × r × t = $1500 × 9% × 6 = $810.

12 questions · Seed 46 · Age guidance, not curriculum certification