Free Grade 3 Simple Interest Flashcards
Free Grade 3 flashcards for Simple 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
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify simple interest
Identify simple interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain simple interest
Explain simple interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate simple interest
Calculate simple interest accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare simple interest
Compare simple 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 Simple 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 10% of 520.[1]
- 2.Find 50% of 160.[1]
- 3.Find 75% of 780.[1]
- 4.Find 75% of 320.[1]
- 5.Find 30% of 580.[2]
- 6.Find 5% of 680.[2]
- 7.Find 60% of 160.[2]
- 8.Find 15% of 380.[2]
- 9.Increase $420.00 by 15%.[3]
- 10.Increase $800.00 by 15%.[3]
- 11.Decrease $540.00 by 5%.[3]
- 12.Increase $480.00 by 30%.[3]
Show answers and working
1. 52
1% of 520 = 5.2. 10% = 5.2 × 10 = 52.
2. 80
1% of 160 = 1.6. 50% = 1.6 × 50 = 80.
3. 585
1% of 780 = 7.8. 75% = 7.8 × 75 = 585.
4. 240
1% of 320 = 3.2. 75% = 3.2 × 75 = 240.
5. 174
1% of 580 = 5.8. 30% = 5.8 × 30 = 174.
6. 34
1% of 680 = 6.8. 5% = 6.8 × 5 = 34.
7. 96
1% of 160 = 1.6. 60% = 1.6 × 60 = 96.
8. 57
1% of 380 = 3.8. 15% = 3.8 × 15 = 57.
9. $483.00
Multiplier: 1 + 0.15 = 1.15. 420 × 1.15 = 483.
10. $920.00
Multiplier: 1 + 0.15 = 1.15. 800 × 1.15 = 920.
11. $513.00
Multiplier: 1 − 0.05 = 0.95. 540 × 0.95 = 513.
12. $624.00
Multiplier: 1 + 0.3 = 1.3. 480 × 1.3 = 624.
Worked examples
Find 75% of 160.
- 1% of 160 = 1.6.
- 75% = 1.6 × 75 = 120.
- Answer: 120
Find 35% of 240.
- 1% of 240 = 2.4.
- 35% = 2.4 × 35 = 84.
- Answer: 84
Decrease $380.00 by 12.5%.
- Multiplier: 1 − 0.125 = 0.875.
- 380 × 0.875 = 332.5.
- Answer: $332.50
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 Simple Interest
One concept, one ecosystem — all of it free.
Goes deeper
The entities below this one, each with the same complete free resource set.
Sibling concepts
Related concepts
Lateral links, including across subjects.
Next topics
All free formats for this concept
Every kind below is a real page, generated from this entity.
Learn — Meet the idea.
Practice — Build fluency.
Revise — Keep it in memory.
Assess — Prove mastery.
Apply — Use it in context.
Teach — Deliver it to a class.
Frequently asked
- Is this Grade 3 Simple Interest flashcards really free?
- Yes. Every flashcards 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 Percentage Change, Reverse Percentages, Decimals. Each one has its own free lesson, worksheet and quiz.
- How is the flashcards 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 Simple Interest?
- Move on to Compound Interest, Whole Numbers, Counting, Number Recognition, which build directly on this idea.
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