Free Grade 3 Simple Interest in Context Lesson Plans
Free Grade 3 lesson plans 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
30 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 50% of 500.[1]
- 2.Find 75% of 140.[1]
- 3.Find 75% of 700.[1]
- 4.Find 25% of 120.[1]
- 5.Find 30% of 160.[2]
- 6.Find 15% of 380.[2]
- 7.Find 20% of 440.[2]
- 8.Find 15% of 740.[2]
- 9.Increase $340.00 by 5%.[3]
- 10.Increase $140.00 by 15%.[3]
- 11.Increase $740.00 by 60%.[3]
- 12.Decrease $460.00 by 12.5%.[3]
Show answers and working
1. 250
1% of 500 = 5. 50% = 5 × 50 = 250.
2. 105
1% of 140 = 1.4. 75% = 1.4 × 75 = 105.
3. 525
1% of 700 = 7. 75% = 7 × 75 = 525.
4. 30
1% of 120 = 1.2. 25% = 1.2 × 25 = 30.
5. 48
1% of 160 = 1.6. 30% = 1.6 × 30 = 48.
6. 57
1% of 380 = 3.8. 15% = 3.8 × 15 = 57.
7. 88
1% of 440 = 4.4. 20% = 4.4 × 20 = 88.
8. 111
1% of 740 = 7.4. 15% = 7.4 × 15 = 111.
9. $357.00
Multiplier: 1 + 0.05 = 1.05. 340 × 1.05 = 357.
10. $161.00
Multiplier: 1 + 0.15 = 1.15. 140 × 1.15 = 161.
11. $1184.00
Multiplier: 1 + 0.6 = 1.6. 740 × 1.6 = 1184.
12. $402.50
Multiplier: 1 − 0.125 = 0.875. 460 × 0.875 = 402.5.
Worked examples
Find 75% of 240.
- 1% of 240 = 2.4.
- 75% = 2.4 × 75 = 180.
- Answer: 180
Find 20% of 480.
- 1% of 480 = 4.8.
- 20% = 4.8 × 20 = 96.
- Answer: 96
Decrease $560.00 by 35%.
- Multiplier: 1 − 0.35 = 0.65.
- 560 × 0.65 = 364.
- Answer: $364.00
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.
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Frequently asked
- Is this Grade 3 Simple Interest in Context lesson plan really free?
- Yes. Every lesson plans 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 plan 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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