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. $200 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$200 · 2% · 1 · Simple interest & savings
2. $1700 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$1700 · 3% · 4 · Simple interest & savings
3. $900 is invested at 8% simple interest per year for 4 years. How much simple interest is earned?
$900 · 8% · 4 · Simple interest & savings
4. $900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$900 · 10% · 4 · Simple interest & savings
5. $700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$700 · 9% · 3 · 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. $900 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$900 · 9% · 3 · Simple interest & savings
8. $1500 is invested at 9% simple interest per year for 1 year. How much simple interest is earned?
$1500 · 9% · 1 · Simple interest & savings
9. $1600 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
$1600 · 6% · 3 · Simple interest & savings
10. $1500 is invested at 9% simple interest per year for 2 years. How much simple interest is earned?
$1500 · 9% · 2 · Simple interest & savings
11. $900 is invested at 10% simple interest per year for 5 years. How much simple interest is earned?
$900 · 10% · 5 · Simple interest & savings
12. $1200 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1200 · 8% · 1 · Simple interest & savings

12 questions · Seed 104734 · 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. $200 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$4
Simple interest I = P × r × t = $200 × 2% × 1 = $4.
2. $1700 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$204
Simple interest I = P × r × t = $1700 × 3% × 4 = $204.
3. $900 is invested at 8% simple interest per year for 4 years. How much simple interest is earned?
$288
Simple interest I = P × r × t = $900 × 8% × 4 = $288.
4. $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.
5. $700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$189
Simple interest I = P × r × t = $700 × 9% × 3 = $189.
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. $900 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$243
Simple interest I = P × r × t = $900 × 9% × 3 = $243.
8. $1500 is invested at 9% simple interest per year for 1 year. How much simple interest is earned?
$135
Simple interest I = P × r × t = $1500 × 9% × 1 = $135.
9. $1600 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
$288
Simple interest I = P × r × t = $1600 × 6% × 3 = $288.
10. $1500 is invested at 9% simple interest per year for 2 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $1500 × 9% × 2 = $270.
11. $900 is invested at 10% simple interest per year for 5 years. How much simple interest is earned?
$450
Simple interest I = P × r × t = $900 × 10% × 5 = $450.
12. $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.

12 questions · Seed 104734 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $200 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$200 · 2% · 1 · Simple interest & savings
2. $1700 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$1700 · 3% · 4 · Simple interest & savings
3. $900 is invested at 8% simple interest per year for 4 years. How much simple interest is earned?
$900 · 8% · 4 · Simple interest & savings
4. $900 is invested at 10% simple interest per year for 4 years. How much simple interest is earned?
$900 · 10% · 4 · Simple interest & savings
5. $700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$700 · 9% · 3 · 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. $900 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$900 · 9% · 3 · Simple interest & savings
8. $1500 is invested at 9% simple interest per year for 1 year. How much simple interest is earned?
$1500 · 9% · 1 · Simple interest & savings
9. $1600 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
$1600 · 6% · 3 · Simple interest & savings
10. $1500 is invested at 9% simple interest per year for 2 years. How much simple interest is earned?
$1500 · 9% · 2 · Simple interest & savings
11. $900 is invested at 10% simple interest per year for 5 years. How much simple interest is earned?
$900 · 10% · 5 · Simple interest & savings
12. $1200 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1200 · 8% · 1 · Simple interest & savings

12 questions · Seed 104734 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $200 is invested at 2% simple interest per year for 1 year. How much simple interest is earned?
$4
Simple interest I = P × r × t = $200 × 2% × 1 = $4.
2. $1700 is invested at 3% simple interest per year for 4 years. How much simple interest is earned?
$204
Simple interest I = P × r × t = $1700 × 3% × 4 = $204.
3. $900 is invested at 8% simple interest per year for 4 years. How much simple interest is earned?
$288
Simple interest I = P × r × t = $900 × 8% × 4 = $288.
4. $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.
5. $700 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$189
Simple interest I = P × r × t = $700 × 9% × 3 = $189.
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. $900 is invested at 9% simple interest per year for 3 years. How much simple interest is earned?
$243
Simple interest I = P × r × t = $900 × 9% × 3 = $243.
8. $1500 is invested at 9% simple interest per year for 1 year. How much simple interest is earned?
$135
Simple interest I = P × r × t = $1500 × 9% × 1 = $135.
9. $1600 is invested at 6% simple interest per year for 3 years. How much simple interest is earned?
$288
Simple interest I = P × r × t = $1600 × 6% × 3 = $288.
10. $1500 is invested at 9% simple interest per year for 2 years. How much simple interest is earned?
$270
Simple interest I = P × r × t = $1500 × 9% × 2 = $270.
11. $900 is invested at 10% simple interest per year for 5 years. How much simple interest is earned?
$450
Simple interest I = P × r × t = $900 × 10% × 5 = $450.
12. $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.

12 questions · Seed 104734 · Age guidance, not curriculum certification