Free Grade 3 Introducing Compound Interest Worksheets
Free Grade 3 worksheets for Introducing Compound Interest: 12 real questions with a full answer key and worked solutions. Per cent means 'out of 100'. Find 10% by dividing by 10 or 1% by dividing by 100, then build up. For an increase or decrease, use a multiplier.
Free
Stretch
30 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain introducing compound interest
Explain introducing compound interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing compound interest
Calculate introducing compound interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing compound interest
Compare introducing compound interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify introducing compound interest
Justify introducing compound interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
Prerequisites
Close these gaps first — each has its own free lesson, worksheet and quiz.
How Introducing Compound Interest works
Per cent means 'out of 100'. Find 10% by dividing by 10 or 1% by dividing by 100, then build up. For an increase or decrease, use a multiplier.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.Find 50% of 180.[1]
- 2.Find 25% of 680.[1]
- 3.Find 50% of 720.[1]
- 4.Find 10% of 640.[1]
- 5.Find 5% of 80.[2]
- 6.Find 60% of 180.[2]
- 7.Find 20% of 380.[2]
- 8.Find 35% of 560.[2]
- 9.Increase $380.00 by 35%.[3]
- 10.Increase $200.00 by 12.5%.[3]
- 11.Decrease $240.00 by 12.5%.[3]
- 12.Decrease $460.00 by 12.5%.[3]
Show answers and working
1. 90
1% of 180 = 1.8. 50% = 1.8 × 50 = 90.
2. 170
1% of 680 = 6.8. 25% = 6.8 × 25 = 170.
3. 360
1% of 720 = 7.2. 50% = 7.2 × 50 = 360.
4. 64
1% of 640 = 6.4. 10% = 6.4 × 10 = 64.
5. 4
1% of 80 = 0.8. 5% = 0.8 × 5 = 4.
6. 108
1% of 180 = 1.8. 60% = 1.8 × 60 = 108.
7. 76
1% of 380 = 3.8. 20% = 3.8 × 20 = 76.
8. 196
1% of 560 = 5.6. 35% = 5.6 × 35 = 196.
9. $513.00
Multiplier: 1 + 0.35 = 1.35. 380 × 1.35 = 513.
10. $225.00
Multiplier: 1 + 0.125 = 1.125. 200 × 1.125 = 225.
11. $210.00
Multiplier: 1 − 0.125 = 0.875. 240 × 0.875 = 210.
12. $402.50
Multiplier: 1 − 0.125 = 0.875. 460 × 0.875 = 402.5.
Worked examples
Find 50% of 580.
- 1% of 580 = 5.8.
- 50% = 5.8 × 50 = 290.
- Answer: 290
Find 20% of 80.
- 1% of 80 = 0.8.
- 20% = 0.8 × 20 = 16.
- Answer: 16
Increase $100.00 by 5%.
- Multiplier: 1 + 0.05 = 1.05.
- 100 × 1.05 = 105.
- Answer: $105.00
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Finds 10% and stops when asked for a 10% decrease.
Correction: Subtract the 10% from the original.
Thinks a 50% rise then 50% fall returns to the start.
Correction: The second percentage is of a different amount.
Teacher tips
- · Teach 10%, 5%, 1% building blocks before multipliers.
Parent tips
- · Work out the tip at a restaurant together.
Real-life applications
- · Sales, tips, tax and interest.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
Every free resource for Introducing Compound Interest
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Frequently asked
- Is this Grade 3 Introducing Compound Interest worksheet really free?
- Yes. Every worksheets on FreeMathWorksheet is free to use, print and share — no account, no paywall and no watermark.
- What should a learner already know before this?
- Start with Simple Interest. Each one has its own free lesson, worksheet and quiz.
- How is the worksheet sequenced?
- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
- What comes next after Introducing Compound Interest?
- Move on to Working with Compound Interest, Compound Interest in Context, Percentage of an Amount, Percentage Increase, which build directly on this idea.
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