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. $400 is invested at 2% simple interest per year for 2 years. How much simple interest is earned?
$400 · 2% · 2 · 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. $1000 is invested at 4% simple interest per year for 5 years. How much simple interest is earned?
$1000 · 4% · 5 · Simple interest & savings
4. $100 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$100 · 3% · 4 · Simple interest & savings
5. $1600 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$1600 · 4% · 6 · Simple interest & savings
6. $1200 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1200 · 8% · 1 · Simple interest & savings
7. $1400 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$1400 · 9% · 6 · Simple interest & savings
8. $900 is invested at 6% simple interest per year for 5 years. How much simple interest is earned?
$900 · 6% · 5 · Simple interest & savings
9. $100 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$100 · 8% · 3 · Simple interest & savings
10. $1400 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
$1400 · 6% · 3 · Simple interest & savings
11. $300 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$300 · 3% · 5 · Simple interest & savings
12. $700 is invested at 7% simple interest per year for 6 years. How much simple interest is earned?
$700 · 7% · 6 · Simple interest & savings

12 questions · Seed 58 · 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. $400 is invested at 2% simple interest per year for 2 years. How much simple interest is earned?
$16
Simple interest I = P × r × t = $400 × 2% × 2 = $16.
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. $1000 is invested at 4% simple interest per year for 5 years. How much simple interest is earned?
$200
Simple interest I = P × r × t = $1000 × 4% × 5 = $200.
4. $100 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$12
Simple interest I = P × r × t = $100 × 3% × 4 = $12.
5. $1600 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$384
Simple interest I = P × r × t = $1600 × 4% × 6 = $384.
6. $1200 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$96
Simple interest I = P × r × t = $1200 × 8% × 1 = $96.
7. $1400 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$756
Simple interest I = P × r × t = $1400 × 9% × 6 = $756.
8. $900 is invested at 6% simple interest per year for 5 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $900 × 6% × 5 = $270.
9. $100 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$24
Simple interest I = P × r × t = $100 × 8% × 3 = $24.
10. $1400 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
$252
Simple interest I = P × r × t = $1400 × 6% × 3 = $252.
11. $300 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$45
Simple interest I = P × r × t = $300 × 3% × 5 = $45.
12. $700 is invested at 7% simple interest per year for 6 years. How much simple interest is earned?
$294
Simple interest I = P × r × t = $700 × 7% × 6 = $294.

12 questions · Seed 58 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 16-18

Simple interest & savings

Take your time. Show your thinking.

1. $400 is invested at 2% simple interest per year for 2 years. How much simple interest is earned?
$400 · 2% · 2 · 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. $1000 is invested at 4% simple interest per year for 5 years. How much simple interest is earned?
$1000 · 4% · 5 · Simple interest & savings
4. $100 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$100 · 3% · 4 · Simple interest & savings
5. $1600 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$1600 · 4% · 6 · Simple interest & savings
6. $1200 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1200 · 8% · 1 · Simple interest & savings
7. $1400 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$1400 · 9% · 6 · Simple interest & savings
8. $900 is invested at 6% simple interest per year for 5 years. How much simple interest is earned?
$900 · 6% · 5 · Simple interest & savings
9. $100 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$100 · 8% · 3 · Simple interest & savings
10. $1400 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
$1400 · 6% · 3 · Simple interest & savings
11. $300 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$300 · 3% · 5 · Simple interest & savings
12. $700 is invested at 7% simple interest per year for 6 years. How much simple interest is earned?
$700 · 7% · 6 · Simple interest & savings

12 questions · Seed 58 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 16-18

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $400 is invested at 2% simple interest per year for 2 years. How much simple interest is earned?
$16
Simple interest I = P × r × t = $400 × 2% × 2 = $16.
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. $1000 is invested at 4% simple interest per year for 5 years. How much simple interest is earned?
$200
Simple interest I = P × r × t = $1000 × 4% × 5 = $200.
4. $100 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$12
Simple interest I = P × r × t = $100 × 3% × 4 = $12.
5. $1600 is invested at 4% simple interest per year for 6 years. How much simple interest is earned?
$384
Simple interest I = P × r × t = $1600 × 4% × 6 = $384.
6. $1200 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$96
Simple interest I = P × r × t = $1200 × 8% × 1 = $96.
7. $1400 is invested at 9% simple interest per year for 6 years. How much simple interest is earned?
$756
Simple interest I = P × r × t = $1400 × 9% × 6 = $756.
8. $900 is invested at 6% simple interest per year for 5 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $900 × 6% × 5 = $270.
9. $100 is invested at 8% simple interest per year for 3 years. How much simple interest is earned?
$24
Simple interest I = P × r × t = $100 × 8% × 3 = $24.
10. $1400 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
$252
Simple interest I = P × r × t = $1400 × 6% × 3 = $252.
11. $300 is invested at 3% simple interest per year for 5 years. How much simple interest is earned?
$45
Simple interest I = P × r × t = $300 × 3% × 5 = $45.
12. $700 is invested at 7% simple interest per year for 6 years. How much simple interest is earned?
$294
Simple interest I = P × r × t = $700 × 7% × 6 = $294.

12 questions · Seed 58 · Age guidance, not curriculum certification