1
CHAPTER AT A GLANCE
Large Numbers Around Us
•Unit: Number System
•Board weightage: Place value, Indian and international systems, rounding, estimation and the number of digits in products give regular 1-mark, 2-mark and 3-mark questions (please check the latest sample paper)
•Key ideas from the textbook: size of a lakh, reading and writing large numbers, crore and arab, Indian and American systems, nearest neighbours, estimating sums and differences, multiplying by 10, 100, 1000 and by 5, 25, 125, number of digits in a product
•Most scoring part: writing numbers in figures and words in both systems, estimation with a stated reason, and reasoning about the number of digits
•Time to revise: about 50 minutes
1 of 8