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Number System: An Introduction — Chapter Summary

ICSE · Class 7 · Computer Studies

Summary of Number System: An Introduction for ICSE Class 7 Computer Studies. Part of the ICSE Class 7 Computer Studies syllabus.

43 questions40 flashcards7 formulas & key relations5 concepts

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Overview

Number systems are used to write and read numbers in different forms. A computer stores numbers, letters, and other characters in coded form and works internally in binary. Four number systems are commonly used with computers: decimal, binary, octal, and hexadecimal. Each system has a different base

Key Concepts

The decimal number system uses

The decimal number system uses the digits 0 to 9 and has base 10. A number such as (3435)10 has digits in different places, such as thousand's, hundre

The binary number system uses only

The binary number system uses only 0 and 1 and has base 2. A binary number such as (1101)2 contains only these two digits.

The octal number system uses digits

The octal number system uses digits from 0 to 7 and has base 8. Each octal digit has a unique 3-bit binary equivalent.

The hexadecimal number system uses digits

The hexadecimal number system uses digits 0 to 15, with 10 to 15 written as A to F, and has base 16. Each hex digit has a unique 4-bit binary equivale

A decimal number is divided repeatedly

A decimal number is divided repeatedly by 2 until the quotient becomes 0. The remainders are arranged from LSB to MSB to get the binary number. For ex

Learning Objectives

  • Understand the meaning of decimal, binary, octal, and hexadecimal number systems.
  • Recognise the base and digits used in each number system.
  • Convert decimal numbers to binary, octal, and hexadecimal forms.
  • Convert binary, octal, and hexadecimal numbers back to decimal form.
  • Convert binary numbers to octal and hexadecimal form using grouping methods.

Frequently Asked Questions

What are the important topics in Number System: An Introduction for ICSE Class 7 Computer Studies?
Key topics in Number System: An Introduction include Decimal Number System, Binary Number System, Octal Number System, Hexa-Decimal Number System. Study these first, then practise questions on each for Class 7 exams.
How should I revise Number System: An Introduction for Class 7 exams?
Learn the core ideas first, then work through the 43 practice questions on Number System: An Introduction. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 7 Computer Studies Chapter Summary

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