Class 7 Maths - ODISHA
Large Numbers Around Us
The chapter 'Large Numbers Around Us' in Class 7 Mathematics for the Odisha Board (BSE) introduces students to numbers beyond thousands and lakhs, helping them understand crores and the International System of numeration. In daily life, we encounter massive figures like the population of a country or distances between planets. This chapter teaches you how to read, write, compare, and perform operations on such large numbers using place value charts. Mastering this chapter is crucial for your board exams as it builds the foundation for number sense, estimation, and simplification of large mathematical expressions, carrying around 5 to 8 marks in term exams.
Start Learning FreeKey Concepts
Indian System of Numeration
A system of reading and writing large numbers using periods of Ones, Thousands, Lakhs, and Crores, with commas placed after every 2 digits from the right after the thousands period.
International System of Numeration
A globally used system where numbers are grouped into periods of Ones, Thousands, Millions, and Billions, with commas placed after every 3 digits from the right.
Place Value and Face Value
Face value is the actual digit itself, while place value is the product of the face value and the value of its position in the number.
Estimation and Rounding Off
The process of finding a number that is close enough to the exact value, usually rounded to the nearest tens, hundreds, thousands, or lakhs for easier calculations.
Comparison of Large Numbers
Comparing numbers by first checking the total number of digits, and if digits are equal, comparing place values from left to right.
Important Formulas
Board Exam Info
In the Odisha Board (BSE) Class 7 Mathematics examinations, this chapter typically carries about 5 to 8 marks. Questions usually include converting numbers between Indian and International systems, placing commas correctly, finding place values, and word problems based on real-life scenarios involving large additions and subtractions.
Frequently Asked Questions
How many zeros are there in one crore according to the Indian system?
There are 7 zeros in one crore (1,00,00,000).
How do we place commas in the International System of Numeration?
In the International System, commas are placed after every 3 digits starting from the right (e.g., 1,234,567).
How many lakhs make one million?
Ten lakhs make one million (1,000,000 equals 10,00,000).
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