Free Grade 3 Working with Compound Interest Worksheets
Free Grade 3 worksheets for Working with 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
Core
20 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with compound interest
Explain working with compound interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with compound interest
Calculate working with compound interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with compound interest
Compare working with compound interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with compound interest
Justify working with 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 Working with 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 75% of 740.[1]
- 2.Find 25% of 800.[1]
- 3.Find 50% of 360.[1]
- 4.Find 10% of 40.[1]
- 5.Find 20% of 700.[2]
- 6.Find 12.5% of 440.[2]
- 7.Find 5% of 560.[2]
- 8.Find 12.5% of 760.[2]
- 9.Increase $520.00 by 15%.[3]
- 10.Increase $760.00 by 35%.[3]
- 11.Increase $260.00 by 5%.[3]
- 12.Decrease $680.00 by 60%.[3]
Show answers and working
1. 555
1% of 740 = 7.4. 75% = 7.4 × 75 = 555.
2. 200
1% of 800 = 8. 25% = 8 × 25 = 200.
3. 180
1% of 360 = 3.6. 50% = 3.6 × 50 = 180.
4. 4
1% of 40 = 0.4. 10% = 0.4 × 10 = 4.
5. 140
1% of 700 = 7. 20% = 7 × 20 = 140.
6. 55
1% of 440 = 4.4. 12.5% = 4.4 × 12.5 = 55.
7. 28
1% of 560 = 5.6. 5% = 5.6 × 5 = 28.
8. 95
1% of 760 = 7.6. 12.5% = 7.6 × 12.5 = 95.
9. $598.00
Multiplier: 1 + 0.15 = 1.15. 520 × 1.15 = 598.
10. $1026.00
Multiplier: 1 + 0.35 = 1.35. 760 × 1.35 = 1026.
11. $273.00
Multiplier: 1 + 0.05 = 1.05. 260 × 1.05 = 273.
12. $272.00
Multiplier: 1 − 0.6 = 0.4. 680 × 0.4 = 272.
Worked examples
Find 25% of 520.
- 1% of 520 = 5.2.
- 25% = 5.2 × 25 = 130.
- Answer: 130
Find 40% of 420.
- 1% of 420 = 4.2.
- 40% = 4.2 × 40 = 168.
- Answer: 168
Increase $700.00 by 35%.
- Multiplier: 1 + 0.35 = 1.35.
- 700 × 1.35 = 945.
- Answer: $945.00
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 Working with Compound Interest
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Frequently asked
- Is this Grade 3 Working with 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 Introducing Compound Interest, 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 Working with Compound Interest?
- Move on to Compound Interest in Context, Percentage of an Amount, Percentage Increase, Percentage Decrease, which build directly on this idea.
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