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Expressions using Letter-Numbers — Revision Notes

CBSE · Class 7 · Mathematics

Expressions using Letter-Numbers revision notes for CBSE Class 7 Mathematics: 4 topics in quick points. Part of the CBSE Class 7 Mathematics syllabus.

45 questions56 flashcards8 formulas & key relations5 concepts

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Key Topics to Revise

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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.
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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.
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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?
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.

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All CBSE Class 7 Mathematics Revision Notes

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