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.

New variation Try interactive challenge Browse templates

Age band:Ages 13-15 Ages 16-18

Choose “Save as PDF” to keep a copy. Use your browser’s paper setting for A4 or Letter.

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $1400 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1400 · 8% · 1 · Simple interest & savings
2. $1300 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$1300 · 2% · 4 · Simple interest & savings
3. $800 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$800 · 3% · 6 · Simple interest & savings
4. $1500 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$1500 · 7% · 3 · Simple interest & savings
5. $800 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$800 · 7% · 4 · Simple interest & savings
6. $1800 is invested at 8% simple interest per year for 6 years. How much simple interest is earned?
$1800 · 8% · 6 · 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. $1600 is invested at 5% simple interest per year for 1 year. How much simple interest is earned?
$1600 · 5% · 1 · Simple interest & savings
9. $900 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$900 · 4% · 2 · Simple interest & savings
10. $1200 is invested at 9% simple interest per year for 4 years. How much simple interest is earned?
$1200 · 9% · 4 · Simple interest & savings
11. $1800 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$1800 · 6% · 2 · Simple interest & savings
12. $1600 is invested at 3% simple interest per year for 1 year. How much simple interest is earned?
$1600 · 3% · 1 · Simple interest & savings

12 questions · Seed 104742 · 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. $1400 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$112
Simple interest I = P × r × t = $1400 × 8% × 1 = $112.
2. $1300 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$104
Simple interest I = P × r × t = $1300 × 2% × 4 = $104.
3. $800 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$144
Simple interest I = P × r × t = $800 × 3% × 6 = $144.
4. $1500 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$315
Simple interest I = P × r × t = $1500 × 7% × 3 = $315.
5. $800 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$224
Simple interest I = P × r × t = $800 × 7% × 4 = $224.
6. $1800 is invested at 8% simple interest per year for 6 years. How much simple interest is earned?
$864
Simple interest I = P × r × t = $1800 × 8% × 6 = $864.
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. $1600 is invested at 5% simple interest per year for 1 year. How much simple interest is earned?
$80
Simple interest I = P × r × t = $1600 × 5% × 1 = $80.
9. $900 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$72
Simple interest I = P × r × t = $900 × 4% × 2 = $72.
10. $1200 is invested at 9% simple interest per year for 4 years. How much simple interest is earned?
$432
Simple interest I = P × r × t = $1200 × 9% × 4 = $432.
11. $1800 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$216
Simple interest I = P × r × t = $1800 × 6% × 2 = $216.
12. $1600 is invested at 3% simple interest per year for 1 year. How much simple interest is earned?
$48
Simple interest I = P × r × t = $1600 × 3% × 1 = $48.

12 questions · Seed 104742 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Simple interest & savings

Take your time. Show your thinking.

1. $1400 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$1400 · 8% · 1 · Simple interest & savings
2. $1300 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$1300 · 2% · 4 · Simple interest & savings
3. $800 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$800 · 3% · 6 · Simple interest & savings
4. $1500 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$1500 · 7% · 3 · Simple interest & savings
5. $800 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$800 · 7% · 4 · Simple interest & savings
6. $1800 is invested at 8% simple interest per year for 6 years. How much simple interest is earned?
$1800 · 8% · 6 · 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. $1600 is invested at 5% simple interest per year for 1 year. How much simple interest is earned?
$1600 · 5% · 1 · Simple interest & savings
9. $900 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$900 · 4% · 2 · Simple interest & savings
10. $1200 is invested at 9% simple interest per year for 4 years. How much simple interest is earned?
$1200 · 9% · 4 · Simple interest & savings
11. $1800 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$1800 · 6% · 2 · Simple interest & savings
12. $1600 is invested at 3% simple interest per year for 1 year. How much simple interest is earned?
$1600 · 3% · 1 · Simple interest & savings

12 questions · Seed 104742 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Simple interest & savings

Answers and reasoning. Review before teaching.

1. $1400 is invested at 8% simple interest per year for 1 year. How much simple interest is earned?
$112
Simple interest I = P × r × t = $1400 × 8% × 1 = $112.
2. $1300 is invested at 2% simple interest per year for 4 years. How much simple interest is earned?
$104
Simple interest I = P × r × t = $1300 × 2% × 4 = $104.
3. $800 is invested at 3% simple interest per year for 6 years. How much simple interest is earned?
$144
Simple interest I = P × r × t = $800 × 3% × 6 = $144.
4. $1500 is invested at 7% simple interest per year for 3 years. How much simple interest is earned?
$315
Simple interest I = P × r × t = $1500 × 7% × 3 = $315.
5. $800 is invested at 7% simple interest per year for 4 years. How much simple interest is earned?
$224
Simple interest I = P × r × t = $800 × 7% × 4 = $224.
6. $1800 is invested at 8% simple interest per year for 6 years. How much simple interest is earned?
$864
Simple interest I = P × r × t = $1800 × 8% × 6 = $864.
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. $1600 is invested at 5% simple interest per year for 1 year. How much simple interest is earned?
$80
Simple interest I = P × r × t = $1600 × 5% × 1 = $80.
9. $900 is invested at 4% simple interest per year for 2 years. How much simple interest is earned?
$72
Simple interest I = P × r × t = $900 × 4% × 2 = $72.
10. $1200 is invested at 9% simple interest per year for 4 years. How much simple interest is earned?
$432
Simple interest I = P × r × t = $1200 × 9% × 4 = $432.
11. $1800 is invested at 6% simple interest per year for 2 years. How much simple interest is earned?
$216
Simple interest I = P × r × t = $1800 × 6% × 2 = $216.
12. $1600 is invested at 3% simple interest per year for 1 year. How much simple interest is earned?
$48
Simple interest I = P × r × t = $1600 × 3% × 1 = $48.

12 questions · Seed 104742 · Age guidance, not curriculum certification