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Revision Notes

Algebra Play — Revision Notes

CBSE · Class 8 · Mathematics

Algebra Play revision notes for CBSE Class 8 Mathematics: 4 topics in quick points. Part of the CBSE Class 8 Mathematics syllabus.

59 questions68 flashcards10 formulas & key relations5 concepts

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Key Topics to Revise

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1. Think of a Number Tricks

  • A number trick can be explained using a letter-number such as x.
  • The classic trick is: think of a number, double it, add four, divide by two, and subtract the original number.
  • The final result is always 2, no matter what number is started with.
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2. Date-Guessing Trick

  • The month is represented by M and the day by D.
  • The trick gives a final number of the form 100M + 165 + D.
  • If the final answer is known, subtract 165 first.
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3. Number Pyramids

  • In a number pyramid, each number is the sum of the two numbers directly below it.
  • Start from the bottom row and move upward.
  • For the pyramid with top 60 and bottom row 12, c, 8 with middle a, b, the solution is c = 20, a = 32, b = 28.
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4. Virahāṅka-Fibonacci Sequence and Pyramids

  • The Virahāṅka-Fibonacci sequence begins 1, 2, 3, 5, ...
  • Each number is the sum of the two numbers before it.
  • These numbers are used in pyramid exercises.

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Full Notes

Key Concepts

A number is thoughtThe same kind of trick canLet the month be MIn a number pyramidThe sequence begins 1

Frequently Asked Questions

What are the important topics in Algebra Play for CBSE Class 8 Mathematics?
Key topics in Algebra Play include Think of a Number Tricks, Date-Guessing Trick, Number Pyramids, Virahāṅka-Fibonacci Sequence and Pyramids. Study these first, then practise questions on each for Class 8 exams.
How should I revise Algebra Play for Class 8 exams?
Learn the core ideas first, then work through the 59 practice questions on Algebra Play. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Algebra Play

All CBSE Class 8 Mathematics Revision Notes

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