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CHAPTER AT A GLANCE
A Story of Numbers
•Unit: Number System
•Board weightage: This history-of-numbers chapter gives 1-mark and 2-mark questions on landmark numbers, base and place value, and 3-mark conversions between number systems (please check the latest sample paper)
•Key ideas from the textbook: one-to-one mapping, number systems, Roman and Egyptian numerals, landmark numbers, the idea of a base, place value in the Mesopotamian, Mayan, Chinese and Hindu systems, the role of zero
•Most scoring part: writing numbers in the Roman, Egyptian, base-5, Mesopotamian and Mayan systems, and explaining why the Hindu system is efficient
•Time to revise: about 45 minutes
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