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CHAPTER AT A GLANCE
Proportional Reasoning-2
•Unit: Commercial Mathematics and Data Handling
•Board weightage: Ratios with more than two terms, dividing a quantity in a ratio, pie charts, direct and inverse proportion and work-time problems give regular 2-mark, 3-mark and 4-mark questions (please check the latest sample paper)
•Key ideas from the textbook: proportional ratios and cross-multiplication, map scale (Representative Fraction), ratios with many terms, dividing a whole, drawing a pie chart, direct proportion, inverse proportion (xy = constant), working together
•Most scoring part: deciding direct or inverse proportion, writing the statement of proportion and solving it step by step
•Time to revise: about 60 minutes
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