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CHAPTER AT A GLANCE
Expressions using Letter-Numbers
•Unit: Algebra
•Board weightage: Letter-numbers, algebraic expressions, formulas, like and unlike terms, simplification and the value of an expression give regular 1-mark, 2-mark and 3-mark questions (please check the latest sample paper)
•Key ideas from the textbook: letter-numbers, writing expressions for situations and patterns, omitting the multiplication sign, finding the value of an expression, like terms, adding and subtracting expressions, number machines
•Most scoring part: writing the expression from a situation, substituting values, collecting like terms and removing brackets with signs
•Time to revise: about 50 minutes
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