Class 8MathematicsAlgebraic Expressions and Identities
Using Identities for Calculation
Mental math with identities: 103² = (100+3)² = 10000+600+9 = 10609. 97² = (100-3)² = 10000-600+9 = 9409. 103×97 = (100+3)(100-3) = 100²-3² = 10000-9 = 9991. Much faster than direct multiplication! These same identities appear in advanced algebra and calculus.
10 examples
Concept check 1
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on concept check and show the working clearly.
Definition to application 2
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on definition to application and show the working clearly.
Formula warm-up 3
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on formula warm-up and show the working clearly.
Reasoning practice 4
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on reasoning practice and show the working clearly.
Board-style short answer 5
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on board-style short answer and show the working clearly.
Mistake correction 6
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on mistake correction and show the working clearly.
Visual interpretation 7
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on visual interpretation and show the working clearly.
Applied word problem 8
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on applied word problem and show the working clearly.
Revision challenge 9
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on revision challenge and show the working clearly.
Exam recap 10
For Class 8 Mathematics, explain or solve a using identities for calculation question from the chapter "Algebraic Expressions and Identities". Focus on exam recap and show the working clearly.