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Expressions using Letter-Numbers

CBSE · Class 7 · Mathematics

Quick revision notes for Expressions using Letter-Numbers — CBSE Class 7 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

45 questions56 flashcards5 concepts

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Key Topics to Revise

1

1. Letter-numbers and Algebraic Expressions

  • Letters used to represent numbers are called letter-numbers.
  • Expressions containing letter-numbers are called algebraic expressions.
  • Shabnam's age is 3 years more than Aftab's age.
2

2. Revisiting Arithmetic Expressions and Simplification

  • Swapping and grouping of terms does not change the value of an arithmetic expression.
  • Brackets help show which parts must be handled together.
  • A negative sign outside brackets changes the signs inside when the brackets are removed.
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3. Omission of the Multiplication Symbol

  • In algebra, multiplication signs are often omitted.
  • The number is written first, followed by the letter.
  • Writing 4×n is shortened to 4n.
4

4. Simplifying Perimeter Expressions

  • The perimeter of a rectangle can be written using l and b.
  • l stands for length, b stands for breadth, and p stands for perimeter.
  • The initial perimeter expression and the simplified form are equal in value, though they look different.

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Full Notes

Key Concepts

Letters used to represent numbersExpressions containing letterAn algebraic expression takes a numberSwapping and grouping terms does notBy convention

Frequently Asked Questions

What are the important topics in Expressions using Letter-Numbers for CBSE Class 7 Mathematics?
Expressions using Letter-Numbers covers several key topics that are frequently asked in CBSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Expressions using Letter-Numbers — CBSE Class 7 Mathematics?
Understand the core concepts first, then work through the 45 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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