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7/12
10/12−3/12.
Class 7 · Bangla Version · Mathematics
Number, fractions, decimals and percentages
Combine rational-number operations and changes of a percentage base.
About this lesson and its coverage
Original Kidemy Class 7 progression. This level has its own text, examples and questions. Curriculum versions share the progression; complete board-specific coverage still needs specification matching and additional material.
Learn the idea
Use brackets and multiplication before addition. Divide by a fraction by multiplying by its reciprocal when the divisor is nonzero. A price change uses the price before that change as its base.
Worked example
3/4÷1/2=3/2. A 100-taka price raised10% becomes110; a 10% fall from 110 gives 99.
- Identify the quantities and restrictions.
- Show a method with units or symbols.
- Check and explain the result.
Your written practice
Show your working on paper. Check your answer, then choose Next.
Show model answer and explanation
15
The bracket is −5.
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220
200×1.1.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
It asks how many halves fit; each whole contains two halves.
Use a quantity interpretation.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
150×1.2=180;180×0.8=144.
Use the changed base.
Progress and browser storage
Notebook challenge, sources and further study
Apply the idea
Compare two percentage changes on paper and explain why the bases matter.
Review with a guardian or teacher
- Use the stated evidence or givens.
- Show reasoning rather than only a result.
- Review and explain one correction.
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