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Numbers — Class 11 ISC Computer Science revision notes

A 4-page visual revision sheet for Numbers, written for Class 11 ISC Computer Science. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

What this Numbers sheet covers

• A base is a promise about place value
• The four bases the paper uses
• Binary, base 2
• Octal, base 8
• Decimal, base 10
• Hexadecimal, base 16
• Reading any base back into decimal
• positional expansion
• worked, binary
• worked, hexadecimal
• Decimal into any base, by repeated division
• Divide
• Note the remainder
• Repeat
• Read upward
• Grouping bits is faster than dividing
• Worked: subtracting by 2's complement
• Octal against hexadecimal
• Octal
• Hexadecimal
• The two complements, from the same bit pattern
• 1's complement
• 2's complement
• worked on 4 bits
• Subtracting with 1's against 2's complement
• 1's complement method
• 2's complement method
• Words the question will use
• Why the machine prefers 2's complement
• Adding in binary is four facts and a carry
• Traps that cost marks
• Tricks that save time

Open the full Numbers sheet →Free, works offline, no account needed. All 4 pages, plus a study plan built around your own exam dates.

How CapCompass uses this sheet

These notes are not a standalone PDF. CapCompass plans Computer Science chapter by chapter against your real exam dates and free hours, and when the plan reaches Numbers the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.

More Computer Science Class 11 revision notes

• Arrays and Strings
• Basic Input Output and File Handling
• Encodings
• Implementation of Algorithms
• Introduction to Object Oriented Programming using Java
• Methods and Constructors
• Objects and Classes
• Packages
• Primitive Values, Wrapper Classes and Types
• Propositional Logic and Hardware Implementation
• Recursion
• Statements and Scope
• Trends in Computing and Ethical Issues
• Variables and Expressions