Free Grade 3 Simple Interest in Context Lessons
Free Grade 3 lessons for Simple Interest in Context: 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
Higher
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify simple interest in context
Identify simple interest in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain simple interest in context
Explain simple interest in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate simple interest in context
Calculate simple interest in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare simple interest in context
Compare simple interest in context 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 in Context 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 460.[1]
- 2.Find 10% of 100.[1]
- 3.Find 50% of 440.[1]
- 4.Find 25% of 80.[1]
- 5.Find 60% of 600.[2]
- 6.Find 30% of 400.[2]
- 7.Find 12.5% of 280.[2]
- 8.Find 60% of 660.[2]
- 9.Increase $40.00 by 12.5%.[3]
- 10.Increase $520.00 by 35%.[3]
- 11.Decrease $580.00 by 5%.[3]
- 12.Decrease $480.00 by 30%.[3]
Show answers and working
1. 345
1% of 460 = 4.6. 75% = 4.6 × 75 = 345.
2. 10
1% of 100 = 1. 10% = 1 × 10 = 10.
3. 220
1% of 440 = 4.4. 50% = 4.4 × 50 = 220.
4. 20
1% of 80 = 0.8. 25% = 0.8 × 25 = 20.
5. 360
1% of 600 = 6. 60% = 6 × 60 = 360.
6. 120
1% of 400 = 4. 30% = 4 × 30 = 120.
7. 35
1% of 280 = 2.8. 12.5% = 2.8 × 12.5 = 35.
8. 396
1% of 660 = 6.6. 60% = 6.6 × 60 = 396.
9. $45.00
Multiplier: 1 + 0.125 = 1.125. 40 × 1.125 = 45.
10. $702.00
Multiplier: 1 + 0.35 = 1.35. 520 × 1.35 = 702.
11. $551.00
Multiplier: 1 − 0.05 = 0.95. 580 × 0.95 = 551.
12. $336.00
Multiplier: 1 − 0.3 = 0.7. 480 × 0.7 = 336.
Worked examples
Find 75% of 420.
- 1% of 420 = 4.2.
- 75% = 4.2 × 75 = 315.
- Answer: 315
Find 20% of 560.
- 1% of 560 = 5.6.
- 20% = 5.6 × 20 = 112.
- Answer: 112
Increase $600.00 by 20%.
- Multiplier: 1 + 0.2 = 1.2.
- 600 × 1.2 = 720.
- Answer: $720.00
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 Simple Interest in Context
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Learn — Meet the idea.
Practice — Build fluency.
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Assess — Prove mastery.
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Teach — Deliver it to a class.
Frequently asked
- Is this Grade 3 Simple Interest in Context lesson really free?
- Yes. Every lessons 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 Working with Simple Interest, Introducing Simple Interest, Percentage Change. Each one has its own free lesson, worksheet and quiz.
- How is the lesson 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 in Context?
- Move on to Percentage of an Amount, Percentage Increase, Percentage Decrease, Reverse Percentages, which build directly on this idea.
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