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Revision Notes

Algebra Play

CBSE · Class 8 · Mathematics

Quick revision notes for Algebra Play — CBSE Class 8 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

59 questions68 flashcards5 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?
Algebra Play covers several key topics that are frequently asked in CBSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Algebra Play — CBSE Class 8 Mathematics?
Understand the core concepts first, then work through the 59 practice questions available for this chapter. Revise formulas and 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.

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All 14 chapters — CBSE Class 8 Mathematics Revision Notes

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