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Chapter Summary

Expressions using Letter-Numbers — Chapter Summary

CBSE · Class 7 · Mathematics

Summary of Expressions using Letter-Numbers for CBSE Class 7 Mathematics. Part of the CBSE Class 7 Mathematics syllabus.

45 questions56 flashcards8 formulas & key relations5 concepts

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Overview

Letter-numbers are symbols used to represent numbers in mathematics. They help write relationships and patterns in a short and clear form. Algebraic expressions are built from numbers and letter-numbers, and they are useful for finding values, simplifying expressions, and describing patterns that co

Key Concepts

Letters used to represent numbers

Letters used to represent numbers, such as a, b, n, p, and y, are called letter-numbers. Aftab's age can be represented by a letter-number, and Shabna

Expressions containing letter

Expressions containing letter-numbers are called algebraic expressions. A relation such as Shabnam's age = Aftab's age + 3 becomes an algebraic expres

An algebraic expression takes a number

An algebraic expression takes a number value when the letter-number is replaced by a number. For example, if Aftab's age is 23, then Shabnam's age bec

Swapping and grouping terms does not

Swapping and grouping terms does not change the value of an expression. Brackets and a negative sign outside brackets must be handled carefully. The d

By convention

By convention, multiplication signs are omitted in algebraic expressions, and the number is written before the letter. So 4 times n is written as 4n.

Learning Objectives

  • Understand the meaning of letter-numbers
  • Write simple relationships using algebraic expressions
  • Replace letter-numbers with given numbers to find values
  • Use swapping, grouping, and brackets correctly while evaluating expressions
  • Simplify algebraic expressions by removing brackets and combining like terms

Frequently Asked Questions

What are the important topics in Expressions using Letter-Numbers for CBSE Class 7 Mathematics?
Key topics in Expressions using Letter-Numbers include Letter-numbers and Algebraic Expressions, Revisiting Arithmetic Expressions and Simplification, Omission of the Multiplication Symbol, Simplifying Perimeter Expressions. Study these first, then practise questions on each for Class 7 exams.
How should I revise Expressions using Letter-Numbers for Class 7 exams?
Learn the core ideas first, then work through the 45 practice questions on Expressions using Letter-Numbers. 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 Expressions using Letter-Numbers

All CBSE Class 7 Mathematics Chapter Summary

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